Revealing mistake: When Jerry walks towards the crab with the soda bottle cap stuck on his head, one of the crab's legs disappears for a frame or two.
Salt Water Tabby (1947)
1 revealing mistake - chronological order
Directed by: William Hanna, Joseph Barbera
Continuity mistake: When Tom realises he is drinking sea water in the bucket Jerry gave him, he drops the bucket on the towel, but when he spits the water in the girl cat's face, the bucket is nowhere to be seen.