This may turn into a necrobump if it works, but I just remembered one little detail I love that happens about eight or ten seconds into this video. In Killzone 2, when you went to melee an enemy, you would bash them with the butt or grip of your weapon if you could. If you kept pressing it, a separate animation would start where you could just have your protagonist keep on whacking with that weapon. I especially loved that with pistols, as shown in the example.

Fallout New Vegas has lots of locations that can tell complex stories. For example, the Boomers tell you they originated from (I think it was) Vault 31. They never go in-depth about the whole situation of why they left, or what it was like in thw vault. Stop reading if you don't want to see spoilers for the vault's story. As you may know, almost every vault had their own cruel social or scientific experiments. Vault 31's can be summarized with the question, "What would happen if there was an overcrowding, people became aware of the overcrowding, the people became divided, and then weapons were taken away entirely?" Basically, the overseer simulated this, and the people were divided into 3 parties: 1. Those who thought that violent actions should be taken to go through with population control. 2. Those who wanted to get weapons so they could protect themselves from the first party. 3. People who wanted to gtfo. Apparently the Boomers were a part of the third group, and shortly after their escape, the overseer made sure to assign extra guards at the vault door so the experiment would not be failed because of people leaving. People of both remaining parties got angry at this, so a riot began to break out. This riot was targeted towards the arsenal, which was protected by guards. The normal dwellers overpower the guards, but in their destructive haze, they managed to shoot a gun through a wall, and hit the vault's reactor. This reactor begins leaking radiation through the vault, which triggers an automatic lockdown, which is unable to be manually overridden by anyone, even the overseer. This was a miscalculation by the overseer, as he didn't really think that someone would happen to hit the reactor. Now, the lockdown seals the residents inside the vault, and the radiation seeps into the vault, turning the dwellers into feral ghouls. Everyone, besides a group of four people who found a secure room to hide in. This is where you-- a quest-junkie (and maybe literal junkie) of a mailman-- come in. You recieve the quest to come to the vault because of an NCR farm, whose crops are growing poorly. The farmers say they think there is something wrong with the water pipes, and you investigate the trail of pipes, until you're close to Vault 31. You come in, and you have to fight your way through tons of ghouls, along with ghoul guards and a ghoulified overseer. Along the way on the inside, you can find terminals that confirm this story, along with 4 journal fragments from the overseer's journal. You go through a whole lotta vault until you're in the reactor. You find a terminal that says that you can reroute power to a terminal that the four people can access to save them. You find another terminal with the options to either reroute the power, saving the dwellers and dooming the farms, or some other option that basically dooms the four people, but will fix the farms. There is no karma difference for either option, but you can gain NCR fame if you choose to fix the farms, and you can meet the people at the NCR refugee center if you save them, and they can give you items every once in a while if you visit them. This story is just one of many that are hidden in the crevices of the Mojave.

Titanfall 2’s campaign has a lot of subtle foreshadowing, especially at the beginning. The titan you call down in the tutorial is the same one you call down at the end of the game. During the cutscene after the tutorial, two characters will interact with Captain Lastimosa: Major Anderson and Captain Cole. Throughout the campaign, your objective is to rendezvous with Anderson, and Captain Cole shows up again in the mission The Beacon. Also during that cutscene, Lastimosa is shown packing the SERE kit, which you use in the final mission. During the drop from orbit in the opening level, in the background you can see the IMC facility from the level Effect and Cause. Another interesting detail is that throughout the campaign, BT changes how he refers to you. At first he calls you pilot, then Cooper, then finally Jack. It’s a really cool detail the shows the developing bond between pilot and titan.

I've heard the in Super Mario Odyssey, the sound effects change slightly to match with the music or something like that. I'd look it up.

I just recently learned this about Witcher 3 and it blew my damn mind. At the beginning of the game you come across this guy who’s purpose is to introduce you to Gwent. His story is that he’s traveling trying to get closer to the war in order to write a book. Geralt warns him that that kind of thinking is going to get him killed, but he still pursues it. Up until a couple days ago, I thought that was the end of it. Never really knowing what exactly happened to him and you just had to infer from the conversation. Well apparently when you first travel into Velen and you see the Hanging Tree, HES THERE ON THE TREE. Under one of the bodies you can find his unfinished book and the gwent card you can win from him when you first meet if you didn’t end up getting it. That shit is so damn cool to me. That’s such a cool detail

When you play the last campaign mission in For Honor, the Iron Legion and the Samurai team up to take down the Blackstone Legion. Problem is, during the cutscene, you can see Samurai fighting Iron Legion instead of Blackstones.

Tomb raider definitive edition has working mirrors. Which is beyond wonderful. Like, I literally check every video game mirror now just to be disappointed.

Being able to see your legs in First Person Shooters.

When using the dark hand ability/weapon art You actually put your mouth/head to their dark sign, not their mouth. Makes more sense from a lore perspective how its done

In bf1 when you reload if you still have a round in the chamber he won't cock the weapon, if it's an empty magazine he will.

in breath of the wild there are a ton of musical Easter eggs related to ocarina of time. A good example is when you visit any stable the music that starts playing is Epona’s song. Another one is in pokemon black and white if I’m not mistaken. There is a house with two people inside and if you talk to them you find out that one used to be team magma and the other team aqua and now their in love. Yet another is in pokemon Diamond and in Pearl when you enter the haunted house you encounter the ghosts of what seem to be a butler and a little girl. Look in a trash can in the dining room and you’ll find an antidote leading many to think someone was poisoned and the antidote was tossed out dooming them.

In Skyrim, in the Markarth's fence's house he has a cheese wheel and ghost dust set up to look like pacman and ghosts

There's anentire series dedicated to this for just Skyrim. Which is... incredible. But I can't quite remember, it usually just stays on my mind for a while, and I'm like "huh... neat" but then I forget about it.

Witcher 3 is my go to for detail in a game. The quest to deal with the whispering hillock, there are notes around that tell exactly who is trapped there which makes that decision much easier (no spoilers though). A guy tied up on the beach asks to be saved, saving him might mean something later on (again no spoiler). Decisions aren't black and white, they have consequences and not all of them are good. I like that they had that attention to detail to show actions had meaning and not just in the main story.

The two things that come to mind for me are from Dark Souls 1 and 3. In DS1 in the O&S fight, if you kill Ornstein first, you can see his hand twitch right before Smough brings down the hammer, which is quite sad when you think about it. And in DS3 in the Nameless King fight, when you clear the first phase, you can see the King's hand tremble as he raises his swordspear up, which is also sad because he doesn't want to put his loyal Stormdrake down.

From Software even bothering to make high quality textures on tiny parts of armor most people don't bother looking at. There is this one gauntlet in Bloodborne that has small metal circles on it. At first glance, they just look basic until you look up close and see that they are slightly bent out of shape and have small designs on them. In normal gameplay, these metal circles are only a few pixels large.

Probably a lot of environmental story telling people just do not notice as they pass by. One that comes to mind is fallout 3, inside of raven rock. The mess hall in it has a grated floor, if you go below the grate you see a bunch of silverware. Everyone is dropping their forks and stuff and not bothering to go get them lol. Again there's likely a lot of that people just don't take note of.

Any game where weapons/gear have signs of use. For example, in Fallout NV you get a rifle which you pick up off a guy who survived for decades after the bombs fell, and this weapon is in obvious disrepair. The iron sights are crooked, the handle and stock are worn and the frame is generally scratched up in areas that would get damaged after decades of loading/reloading

In the area after the Astral Clocktower in the bloodborne dlc, if you look down into the water you can see pieces of yharnam in the deep. [spoiler]it's not really a small detail though[/spoiler]

The Witcher 3 immediately jumps into my head. It is full to the brim of the smallest details that make a massive difference. Things that are totally unnecessary, that the majority players won't even notice. The beauty spot on Kiera's breast, Vespulla being one of Dandelion's girlfriends, Geralt killing a rat with a fork - there's just so much. On top of that, there's a whole bunch of small animations that have a big impact. Everything blowing with the wind in the same direction and magnitude, Geralt pushing out the sheath for his sword, kids balancing on the wooden planks, and splashing in puddles after the rain.

<The Vex in Destiny 1's Exotic Quest for No Time to Explain at the end don't attack you. The mission is called Blood in the Garden and it seems that literally nobody but me noticed this. You have to physically shoot them to aggravate them instead of them shooting you right off the bat.>