Revealing mistake: During "Our Beginning," True Heart Bear takes a walk beneath the ship's deck to check on the sleeping cubs. But when Proud Heart Cat wakes up for a moment, his tummy symbol is visible - which he's not supposed to receive until arriving at the Kingdom of Caring several minutes later. (00:02:20)ryguy_1983
Revealing mistake: When Ratigan is sneaking up on Basil inside Big Ben, there is a shot where both characters have their backs to the camera. In this shot, there is a piece of equipment directly in front of the turning gear they are standing on. This piece of metal can be seen to flicker for a few moments.
Revealing mistake: During "Never Say Never" Henri instructs Chantal to fly Fievel to immigration where he should be able to find his family. At one point during this shot, Henri's right wing casts no shadow on the Statue of Liberty - only an outline of the wing's shadow is visible. (00:23:25)ryguy_1983