Revealing mistake: The "hand" holding the gun rotates 180 degrees while the shooter's point of view does not move. A real hand can't reproduce that motion without moving extremely close to the face.
Revealing mistake: In the process shot (dummy auto front seat, scenery visible in back window) where father and daughter are driving off to see the circus, Eddie G. makes a left turn and the scenery follows; but he forgets to return the steering wheel to center, even though the scenery shows the car has straightened out on the new course. Funny - even titans nod. That car should still be circling somewhere.
Revealing mistake: The cake Mildred lifts is obviously a solid prop as the "frosting" does not smear her dress when she holds it close to her body.
Revealing mistake: The 'bee' on the window - immobile in the first shot - is just a dummy with static wings. (01:00:45)