Other mistake: When Eomer is mounting his horse after giving Aragorn, Legolas and Gimli the two horses, you can see his sword falling out of its sheath. (00:35:00)
Other mistake: How is it that one slash on Amidala's back ripped off the entire midriff of her shirt, and a sleeve? (01:47:00)
Other mistake: While downstairs Vernon hears Hedwig's squawks, as well as Dobby and Harry's exchange in the bedroom upstairs, distracting enough for them all, including the Masons, to take note. The noise upstairs illicits a reaction from everyone, which Vernon explains is a noisy cat. Yet when Harry very noisily chases Dobby down the steps, Dobby slams into the wall and Harry lands with a loud thud (not remotely 'catlike'), Vernon, who stands on the other side of the shared wall, pleasantly continues his story to his rapt guests, who are also not distracted by the noise. To suggest that such loud noises coming from the hallway right beside them would not draw any reaction from anyone, Vernon and the Masons included, is preposterous. (00:06:45)
Other mistake: The little girl elf pours Santa a mug of hot chocolate, but if you watch closely there is nothing in the mug when he drinks it.
Other mistake: When Margalo lands in Stuart's car after escaping the Falcon, Stuart slams on the brakes, only he hits the gas pedal instead of the brake.
Other mistake: When the guards are breaking into Cassandra's bathing room, we see a guard's arm reach through a hole in the door to unlatch it. However, you can see the door has come off the jamb, with a big gap, before he reaches down to pull the latch.
Other mistake: When the gang is in the mystery machine and Scrappy pees on Daphne and they kick Scrappy out of the car, from a distance the driver isn't Fred - it is someone with dark hair, not blonde.
Other mistake: When Carl and David go down in the submarine, they come across the sunken plane that they crashed in. As they approach the plane, it shows that the it is clearly on the right side of the sub as they go from the tail to the prop. When it cuts back to them in the sub, they are looking to the left. A cut back to the plane still shows that it could only be on the right. Carl then looks out the left port hole of the sub and it clearly shows them going by the plane from prop to tail.