7. Every time Dark Helmet has his face covered, his voice is lower and more basal, similar to James Earl Jones when he played Darth Vader.
In the DVD commentary, Mel Brooks says that the idea of Dark Helmet’s voice changing whenever his face was covered was actually Rick Moranis’s idea.
8. John Candy ad-libbed the line, “Oh, that’s gonna leave a mark,” after standing up without undoing his seat belt.
9. The castle on Druidia is King Ludwig II’s Neuschwanstein Castle in Bavaria.
It has been modified by matte painting with additional ramps. Neuschwanstein Castle has been featured in many motion pictures, and it is the original inspiration for the castle at Disneyland.