Continuity mistake: After Rey touches Luke's lightsaber she begins to have the vision, and when she falls to the floor the blaster is missing from the back of her belt, but after she "sees" Luke and R2 and then stands up the blaster is back again, tucked into her belt (even though Rey's having her vision of things all around her, she herself is not a vision).
Continuity mistake: When first arriving on Earth the aliens do a clean up of things not needed, one of these being toilets, then in a scene minutes later you see the main alien character brushing his teeth with a toilet brush standing next to a toilet. (00:05:45 - 00:07:00)
Continuity mistake: SPOILER - The wounds on Pietro's body change. The most noticeable one is on his right shoulder. The amount of blood decreases too.
Continuity mistake: When Maleficent places the glasses on Beast's face, their position keeps changing all the time.
Factual error: The 'Post Office' is nothing like an English one would have been, even in a remote rural location in Victorian times. It seems to have been transposed from the American Wild West.
Revealing mistake: When Krampus walks toward Max after he yells at him to give him his family back, wires are controlling Krampus' arm. (01:24:30)
Other mistake: When Marry Anne flies into the dark forest for the first time she drops the boutonniere. After seeing the primrose petal she flies off empty handed but has the boutonniere later when she meets Roland.
Character mistake: The poster on the wall near the start reads "Our Egg Donor's [sic.] are helping to fulfill the dreams of women across America." There is an unnecessary apostrophe in the word "Donor's." (00:10:05)
Continuity mistake: Lotte is in her room looking at the checklist for the parade. The size and angle of the quill pen change every time there's a cut. (00:14:40)
Continuity mistake: The resident bully approaches Mara once her rather embarrassing mum left. Mara turns around and tries to power her way out of the predicament; in the background, the girl with the bright red dress has her arm across her waist, but at the cut she has both arms behind her back. (00:02:40)
Visible crew/equipment: When Matthew is following Nina's cries for help through the woods you can see numerous set lights in between the trees (in the distance). (01:09:43)
Continuity mistake: In order for Superman, Wonder Woman and Batman to break into the secret room, they knock it down. Four enemies who were waiting for them in front of the door are crushed by the falling door and blood is splattered, forming a pool of blood in front of the door. During the fight that follows, there are several shots where the knocked over door is shown, but the pool of blood at the front of the door has vanished. (00:07:10)
Continuity mistake: After Thomas biffs the trucks, the position of the way they are derailed changes between shots.
Continuity mistake: When Peter Pan is fighting the tribe's Pan on the trampoline and they're just about to finish Peter Pan off, the elder chief calls for the fight to stop. Peter's arms are above him in the overhead shot but are outstretched in the view from behind Peter.