Deliberate mistake: In the scene where Alicia Silverstone and Dave Foley are in the porno store, they cut to a guy standing behind a counter. All of the explicit shots of the videotape covers on the countertop are blurred out.
Factual error: After some tinkering with a TV set and a mirror, Calvin Webber finds that he can watch a TV show in reverse image. On the screen is the opening of "The Honeymooners" showing the cast members' names superimposed on a picture of the moon, with Jackie Gleason's face. But the picture is in color, mostly blue and off-white, while the actual "Honeymooners" series was filmed in black-and-white.
Answer: Adam: Tempus fugit (Latin) = Time flies. Dad: Que les bons temps roulent! (French) = How good times roll! Adam: Geradeaus, dann links (German) = Straightforward, then left. Dad: Sorgen Sie bitte dafür, dass die [das] Gepäck sorgfältig behandelt werden [wird] (German) = Please make sure that this luggage will be treated carefully. Adam: Haben Sie etwas Nettes in Leder? (German) = Do you have something nice in leather?