1.Taika Waititi is the actor underneath the CGI as Korg in Thor: Ragnarok.
2.Zack Snyder shows up in a coffee shop in his Justice League cut.
3.Emerald Fennell plays a beauty vlogger giving a makeup tutorial for "blowjob lips" in Promising Young Woman.
4.M. Night Shyamalan often appears in his movies, playing Dr. Hill in The Sixth Sense and Ray Reddy in Signs.
5.George Lucas is standing outside the opera dressed as a Pantoran man named Baron Notluwiski Papanoida in Star Wars: Episode III — Revenge of the Sith.
6.Peter Jackson appears as a man eating a carrot in The Lord of the Rings: The Fellowship of the Ring, a Rohan soldier in The Lord of the Rings: The Two Towers, and one of the Corsairs of Umbar in The Lord of the Rings: The Return of the King.