Continuity mistake: After Tom says goodbye to his friends, he goes to sleep on the window ledge. At this point, you can see it's night time, but when we see him sleeping from inside the house in the next shot, it is daylight outside.
Continuity mistake: When Tom is throwing dynamite into Jerry's mouse-hole, you can see he is surrounded by sticks of dynamite, but when Muscles marches out of the hole with the dynamite, the sticks have disappeared.
Continuity mistake: When we first see Bugs' home at the start of the cartoon, there is nothing around the hole. When the camera pans in on the hole, pieces of carrot have appeared.
Continuity mistake: When the monkey walks over the doorman at the end of the cartoon, you can see the doorman has a cigar in the mouth, but in the next shot it has disappeared.
Continuity mistake: In the overheard view of the dog grooming the cat, you can see there is nothing beside them, but in the next shot a blue ribbon suddenly appears.
Continuity mistake: Bugs' home has a mailbox outside of it for most of the cartoon, but when Bugs and Daffy run into his home when on the chase from Elmer, the mailbox has disappeared.
Continuity mistake: When Sam is putting wood in the oven, Bugs tells him to put a log in because he "loves the smell of old hickory." At this point, you can see there are some logs under Bugs, but in the next shot they have disappeared.