What’s a movie you’ve seen multiple times and only later realized, hey wait, *that guy (or girl)* is in this?!

Mine would be Inglorious Basterds. I was scrolling through the cast list on IMDb to see if someone from The Watcher was also in that movie and saw Mike Myers (as in Austin Powers, Wayne from Wayne’s World Mike Myers) listed. How did I miss him when I’ve seen the movie at least three times?? What movie has done this to you?