In spite of his youthful appearance and reckless behavior, the bard Dandelion is supposed to be in his late forties by the time of the game's events. This is actually true to the books, where, a few years before, Dijkstra told Dandelion: "I know you're almost forty, look almost thirty, think you're just over twenty and act as though you're barely ten."
Doug Cockle (who voices Geralt in the English version of the game) said in an interview that he had not played any Witcher game previously in the series, but says that he bought a console this time to finally play Witcher 3 when it releases.
When Geralt in conversation makes the hand motions for the sign "Axii", he is actually spelling it using letters from American Sign Language.
Has real in-game beard growth.
During the quest "Empty Coup" you meet a group of kids, one of whom is named Pete. A little girl in the group will say, "Pete says we're going to live in the woods and wear animal skins and make a tent out of leaves and never grow up". This is a clear reference to Peter Pan.