There is a scene where Bethany (Jack Black) re-spawns and she is not wearing her jacket.
Then the scene switches to somebody else, and when it switches back to her after 2 seconds she is wearing her jacket again.
[Around 49:00] In the bazaar, after Moose died after ate the cake, he re-spawns and lands on a large shelf. In one scene, one can see that the shelf has its right vertical upright totally disassembled from the internal shelves.
A second later, on the left view, the shelf is fully restored in its original state.
When Spencer is standing outside the Freak House. Old Man Vreek appears with no red scarf but when the view comes from the car Old Man Break is wearing a red scarf and then it is gone again when the view goes back to a close up.
While Bethany is composing her selfie, at the beginning of the movie, the coffee mug handle is facing to the left. When the camera angle changes to a wider shot, the mug handle is facing "upward,", which she adjusts to face left. She proceeds to take the selfie with the coffee mug handle facing left.
Removing staples from old magazines to prep them for recycling. There is no actual need to do this according to the recycle guide of MIT. Still the principal (or the writer for that matter) may use it as an intentional pointless task.
This movie is set in Bratford, New Hampshire, the same place the original film was set. At the end of the original film the main characters Alan and Sara take the game and throw it into a river. In the final scene of the original film we see that the game has washed up on a beach and is about to be discovered by two French speaking children. Yet, in 1996, just one year after the events of the original film, the game is back in Bratford, New Hampshire in a teenager's home. There is no explanation given as to how the game made its way back to Bratford.