Continuity mistake: The monster puts his bowl way above the pot for the blind man to serve him. A frame later from a different angle, bowl and pot are at the same level.
Continuity mistake: When Dr. F arrives at the train station there's a lot of smoke/fog around him. In the close-up that comes a split second later it's all gone.
Continuity mistake: Dr. F arrives at the train station and stands to the left of the candle light. A second later he is right in front of it.
Continuity mistake: When Dr. F meets Igor and says "You were sent by Herr Falkstein, weren't you?", the expression on Igor's face from a side view doesn't match the immediate following the front shot (smiling / serious). The rest of the shots changing back to front do match.
Continuity mistake: At the cemetery gate, Dr. F tells Igor to crouch, which he does but very slightly. In the following angle Igor's position is totally different, being crouched at ground level with his hands on a different place.
Continuity mistake: When watching the grave diggers with Igor, Dr. F's hand on Igor's shoulder swaps sides depending on the angle.
Continuity mistake: When Dr. F climbs up the hay cart, the first wide shot shows him with his waist above the cart. The next shot, from the cart's POV, shows him only shoulder level.
Continuity mistake: When Frau Bluecher is talking to the Monster for the first time, she puts her hand on his head. In a closeup shot of the Monster's face her hand and arm are missing.
Continuity mistake: When the blind man serves soup, there's a spoon in a cube on the left skewed to the right. A couple seconds later it's straight.
Continuity mistake: When the monster sits on the teeter-totter and flings Anne Beesley (Little Girl) through the window, she lands on her bed, head on pillow, eyes closed as if asleep (or knocked out by the landing). When her parents, rushing upstairs, open the door, she is tucked neatly under the covers.
Continuity mistake: The blind man reaches for the cigars, and when the angle changes, half a second later, the broken pieces of the mug have changed position and have also increased and suddenly appear scattered all over the table.
Continuity mistake: Frankie arrives at the door of the blind man, who welcomes him. Then there's a close-up of the monster from a bit far away where you can see his shirt and head as if he were alone; however, a frame later the blind man is right next to him, his head almost touching the monster's.
Continuity mistake: Inspector Kemp is known in the village to have had his right arm to be prosthetic (supposedly torn off by the original monster), but during the searching in the woods scene, after the riot starts, when he signals the villagers to keep quiet, his LEFT arm is suddenly prosthetic. The entire shot was apparently made of the villagers moving from left to right, but the negative was threaded backwards to get them to move from right to left. The Inspector's eyepatch is also on the wrong eye, and a villager is holding his shotgun left-handed (shown at the town gathering at the start of the riot as being right-handed).
Suggested correction: It's a running gag: Igor's hump changes sides, Kemp's missing arm and eye change sides.
Brian Katcher
Except that for the whole movie every time Inspector Kemp uses his right arm it keeps making a sound to indicate that it's fake, but he can move his left arm normally, showing that it's his real arm. Not only that but, the moving hump was Marty Feldman's idea. It can't actually be confirmed that Inspector Kemp's prosthetic right being switched to the left for that one scene was part of the gag or not.