Corrected entry: When Wallace is pulled back by his suspender in the wood, his eyes pop out for a second. If you watch frame-by-frame, the eyes on Wallace's model don't disappear when this effect happens. This means there's a pair of eyes on Wallace and another pair in mid-air. An unfinished effect shot, perhaps?
Corrected entry: In the scene where Victor tries to shoot the Were Rabbit from the backyard, you can tell that there are houses directly next to Wallace's. However, in many scenes from the original short films, especially the opening scene of "A Close Shave" where the sheep sneaks into the house, Wallace's house was right next to a street.
Corrected entry: When Gromit gets spooked when Wallace is gone, you can see his shadow above the tunnel entrance. When he gets back in the car, his shadow goes down, then back up. This can't be the Were-Rabbit's shadow because a) the ears are too small and b) Gromit would have seen the Were-Rabbit because it would have been in front of the car for the shadow to be in that spot.
Corrected entry: When the vicar is in the church at the start, and the were-rabbit is in the church as well, the were-rabbit rounds the corner of the pew and there is nothing in front of it. However, when the vicar looks back there is a large stone object next to the pew and should have also been in the shot from the were-rabbit's perspective.
Corrected entry: When the artificial were-rabbit (doll) snaps off the roof of the car while entering the small tunnel Gromit is pulled and 'squashed' against the inside of the roof. You can see Gromit's imprint in the roof in the next scene, shortly before Wallace walks away. In the subsequent scenes/shots when the were-rabbit appears the imprint in the roof has disappeared.
Corrected entry: Lady Tottington's castle is all by itself in the country during most scenes. When the rooftop chase occurs during the festival, many adjacent houses can be seen.