Continuity mistake: When Tom dresses up as Mammy-Two-Shoes and smirks at Butch before hitting him with the frying pan, Tom's left eye is white instead of yellow for about 1-2 seconds.
Continuity mistake: When Jerry rings the gong to tell Tom and Butch to stop fighting, Tom goes back to his seat by the table. When he sits down, the vase on the table next to him changes colour from pink to blue between shots.
Continuity mistake: In the scene when Jerry is hiding in the oven and Tom and Butch turn on the gas, the part on the right hand side of the oven keeps changing from having four holes to three holes between shots.
Continuity mistake: When Butch points his pistol at Tom, you can see that the handle has nothing written on it, but in the next shot the words "Ajax" have appeared.