Revealing mistake: In the scene where Bill and Ted arrive in Hell, they fall down backward when the Devil pulls a lever. If you look closely as they fall, you can see Ted (or his stunt double) holding a stick, perhaps to help break the fall.
Other mistake: Just before the evil robots capture Bill and Ted's girlfriends, after they crash through the window, the girlfriends ask the robots: "Who are you?" and Bill goes "Well, I'm really Evil Ted!" and unzips himself and out pops Evil Ted, and the other robot goes, "And I'm really Evil Bill!" and out pops Evil Bill. When the robots are herding the girlfriends out just before knocking them out with their breath, you can see two sets of clothes in the bottom left corner if you watch closely.
Ted: You are a most excellent scientist, Station.
Bill: Yeah! Plus, you got an excellently huge Martian butt!
Big Station: Station!
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