The Witcher 3: Wild Hunt has a nice Easter egg with Triss' lost earring. Geralt and Triss had a long romance in the Witcher 1 and Witcher 2: Assassins of Kings. Nevertheless, when Yennefer of Vengaberg found their bed in Kaer Morhen she threw it out the window. In the bed in the courtyard to the left is Triss' lost earring. If you give Triss Merigold it you get a nice cut scene.