When the teenage girl is taken by the witch, she first removes the apple from her mouth, but in the next scene where the girl is on the grinder table, the apple is back in place.
When the girl are talking with the police officer, he put her on the speaker and when she threaten him to come, another officer took the handset and start talking and the girl's voice is not on the speaker any more, although now one canceled the speaker button.
When the witch has the first kid on the table there is a crouching man in the background as the camera moves up.
When Max and his brother are attempting to escape from the Witch's basement, they knock down a door and when they fall down the other side, a crew member is visible behind the knocked door for a second.