
Revealing mistake: When we see Dark Helmets' hoverjeep in the desert, watch the front end: you can clearly make out the edge of the mirrored box they used for the "hover" effect.

Deliberate mistake: In the beginning of the movie, when Princess Vespa runs away from her wedding, she gets into a white vehicle. The next shot of the vehicle it is pink, then the next shot it is white again.
Suggested correction: The vehicle is never pink. It's always the same white vehicle. Maybe the light and shadows makes it look pink to you, but it's white.
It's never pink, but it isn't the light and shadows. It's the blue screen effect.