Mice Follies (1954)

Continuity mistake: When Tom attempts to squirt Jerry with the bottle of seltzer, Nibbles sets the freezer to Quick Freeze which freezes the floor and Tom is left frozen. You can see that when Tom is frozen, the bottle leaves an icicle of frozen water, but when Jerry and Nibbles dance around Tom at the end, the icicle has disappeared.

Continuity mistake: After Nibbles pulls off the whiskers on the right-hand side of Tom's face, he puts the whiskers under the carpet near the door. But when Tom tries to capture Jerry and Nibbles in the next shot, the whiskers are fully grown again.