Goo Goo Goliath (1954)

Continuity mistake: When John comes home and finds his son's toys on the lawn, the red truck has a registration number on the back of it, but when John is speaking to Ethel in the next shot, the registration number has disappeared.

Continuity mistake: When the stork is telling the other stork about the party he went to, you can see there is writing in the table on the blackboard behind him. But he sits up on the chair, the writing has gone.

Continuity mistake: When John is trying to start his car, there are no handles on the doors. But when we see a close-up of the car in the next shot, handles have appeared.