Visible crew/equipment: When the ACME Chairman explains his scheme to DJ and Kate, a green screen with two figures in front of it is reflected in the ACME Chairman's glasses.
Factual error: When Brendan Fraser comes out of the Louvre, the Eiffel Tower is right in front of it. The Louvre and the Eiffel Tower are miles away from each other.
Continuity mistake: When DJ and Daffy leave, the car that comes up from the revolving floor is a TVR Tuscan,but when Kate and Bugs,leave for Las Vegas in it, it turns into a Lotus Elise.If you live in Europe, and like cars, this is easy to spot,because the Lotus is and open top car with a flat rear-end, while the TVR is a closed roof car and has a rounder rear-end.
Continuity mistake: Bugs Bunny shows his displeasure with Marvin Martian by keying the Martian Maggot. Later when Bugs Bunny pulls the "Lost Tourist" joke (and wins $5.00 from Daffy Duck) the scratch on the Martian Maggot is repaired.
Revealing mistake: When the Chairman is watching the TV screen where Damien Drake is being interrogated, the man steps in front of the screen and says "he's about to crack," then he walks backwards as if being pulled, but you can tell the moment Damien puts his legs around him, after several steps. So what pulled him back?
Continuity mistake: When Daffy, Bugs, Kate and Brendan are in the forest, Kate and Brendan have knives, but when they encounter Granny the knives are gone.
Revealing mistake: In Africa, DJ and his group ride with Tweety and Sylvester an obviously Indian elephant (much smaller than the African one).
Revealing mistake: Throughout the movie, in Steve Martin's close-ups, you can see the line where his wig is.
Continuity mistake: In the scene with DJ and Daffy Duck in DJ's house, Daffy throws an apple at DJ's face and hits him on the cheek. In the next shot, DJ's rubbing his forehead, as though he got hit there.