Revealing mistake: In the opening shot of the film, at Rockefeller Center, the shot begins at ground level and tilts up the building, but it was shot from the top of the building down to ground level and then reversed - all the people on the ground are walking backwards.
Revealing mistake: When Speedy Gonzales is watching Sylvester drink Tabasco sauce from the tank that sends him miles into the horizon, watch Speedy's tail: it disappears before the scene ends.