2. Following Yennefer
https://www.youtube.com/watch?v=SfMQBiDs8yU Near the beginning of the game, following a few miscellaneous quests - and the felling of a Griffin - you'll come across Yennefer, who after taking you to see Emhyr var Emreis (Game of Thrones' Charles Dance's character), she opens up a portal and disappears off into it. Now, many gamers would've assumed they couldn't follow, instead getting on with the task at hand - but that's not the case. Proving they really did think of everything, CD Projekt included a great little in-joke where if you go after Yennefer, Geralt will spawn in mid-air in the adjacent room, scattering books and items in all directions before remarking he "hate portals". Sadly there's no tiny doll-version of Wheatley to pick up, as that might of been geek-satisfaction overload.