Continuity mistake: When Dr. Sawyer is giving Kris the exam, during the part where Kris is doing the physical coordination test, we see Kris from Sawyer's point of view, and Sawyer is drumming his fingers. When the shot switches to Kris's, he is fingering his eyebrow. When it switches back, fingers drumming. Finally, when it switches back again, his hands are neatly folded in front of him.
Other mistake: In the 1946 MGM film "Good News" - there is a minor flub in the last musical dance number -The Varsity Drag. About 131.13 into the film- a woman dancer wearing a pink dress - just to the left of the screen- stumbles forward and almost falls onto her face while dancing. They left this scene in for some reason. (01:31:10)
Continuity mistake: Pinkie sweeps all the glasses on top of the bar onto the floor, yet after he and his gang have gone we see broken glass on the bar top.
Continuity mistake: When Jerry replaces two keys on the piano with a mousetrap, Tom gets his finger caught and there is a catch lever at the bottom of the trap. But in the next shot when Tom pulls up the mousetrap and his finger expands, the catch lever has disappeared.
Continuity mistake: When Jerry dives into the bottle of invisible ink, he dives in head first. When he emerges from the bottle, it is the bottom half of his body that is invisible first.
Continuity mistake: When the dogs run away from the Mexican hairless dog after thinking she's a skunk, the Mexican dog's ears are pointing up but in the next shot they are pointing down.
Continuity mistake: When the cat places the tiny canary on to the plate, the salt and pepper pots on the table change positions between shots, and the cabinets in the background disappear. He also has a knife and fork in his hands, but after the canary says he's been sick, we return to the cat and the knife and fork have disappeared.
Continuity mistake: When Robert Taylor escapes from the asylum, and is driving the second car he steals, the car is shown at least once with windshield wipers pivoting from above the windshield, then shown with the wipers pivoting from below the windshield. Clearly, these are two different cars. I think the studio borrowed wiper footage from the scene in which he is driving the first stolen car, to use at moments in the scene in which he is driving in the second car.
Continuity mistake: When Jerry opens the door of the refrigerator, there is a piece of corn on the cob on a plate and next to it is a bowl of eggs. In the next shot, the eggs have become fruit.
Continuity mistake: When we see a man and woman sitting by a lake, the plate of pancakes on the picnic blanket moves from the left to the right between shots.