Probably every chessplayer recognizes all kinds of errors which are made in films and other media when chessboards are shown. Boards oriented in the wrong way, queens and kings changed their start positions, illegal moves or positions. I started a Tumblr for collecting examples of this serious misbehaviour on http://chessfails.tumblr.com/ Tips can also be left in the comments here!
Update 30 March 2020: The collection was mentioned in Dutch newspaper Parool!
I love playing chess, fascinating tips, very nice sharing.