While you don't have to play the previous games to play 3, there are small touches that are very cool if you have. Then again, you'll get a lot of these things inside 3, also, if you're paying attention. Because it's obvious the writers paid a lot of attention.
The thing i just find that made me a little melancholy?
[spoiler]The dried up Rose of Remembrance at Triss's house. Haven't found Triss yet (haven't looked much harder), but that was a nice touch.[/spoiler]
English
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The game is full of little tiny details in the dialogue, for example, a reference to the trailer on a dialogue. You're talking to Lambert, and he starts trying to look all tough, then Geralt tells him to kinda tone down cause it was annoying, and he says something along the lines of: "Look who's talking! Wh-what are you doing?!.. Killing monsters. Yeah, Vesimir told me about it, I'm not the only one trying to look tough now, am I?"