While hunchback is watching the inn from outside, the shots showing that were clearly filmed during the night, but when he is shown approaching the inn and Udo leaving it, it's still day.
Blood on Ilse is still fresh when Gotho is carrying her to the other room after the rat attack, but when he is in that next room, it's dry.
When Gotho breaks a bottle on man's head in the laboratory, he breaks it on the back of his head, but in the next shot of the man, his face is burned up from the supposed liquid in the bottle.
When Gotho kills a policeman, policeman fell on his belly, but when he is shown dead, his face is looking up to the sky.
When Gotho is being chased throughout the town by policemen, the time of day changes throughout the scene.
Gotho kills one man by putting him in the iron maiden and he dies instantly, but death by iron maiden takes time.
Ilse clearly breathing when Gotho kisses her in his hideout.
Woman in the hospital dies, but when Gotho approaches her, she can be seen moving a bit and breathing.
Hans is clearly moving after being dead.
Hunchback chops off man's head with an axe with one swing. It would require a lot more effort and strength (and a bigger axe) to do that in one swing.
Hunchback cuts of Udo's feet with a simple knife without any struggle. In reality he would need a saw because of the bone and it would require a lot more effort put into it.