Some time ago I made a blog post about a continuity joke in Young Frankenstein. Mel Brooks would do something similar a few years later in Robin Hood: Men in Tights. The film is Mel Brooks' parody of the Robin Hood legend. It came out in 1993, 2 years after the Kevin Costner movie Robin Hood: Prince of Thieves so it spoofs a lot of elements from that film. One of these is a continuity error.