Continuity mistake: A couple of scenes after the baker's wife ripped off most of Rapunzel's hair, it has grown back to full length so that the prince can climb up to the tower on it.
Continuity mistake: While Annie and Stacks are in the Stacks Mobile helicopter, Annie's seatbelt shoulder strap repeatedly changes from being over her shoulder properly to being under her arm. (01:03:00)
Continuity mistake: When Larry and Nick Daley first enter the British Museum, Nick takes his beanie off twice, in consecutive shots.
Plot hole: While on the boat, Paddington suddenly appears inside the mail sack, thus implying he managed to open the precinct, get inside the sack and find someone who closed the precinct again. An impossible task.
Continuity mistake: Shortly after the Sirens' pendants shatter, Sonata's reappears for a second.
Other mistake: At the Australian championships the last contestant does not get given a chance to throw. They just announce the winners early.
Continuity mistake: When Alexander wakes up to find his brother, Anthony, still asleep, Anthony has no zit on his face. When he looks into the mirror about two minutes later, there is an existing zit on his face, and he has to put a Band-Aid on it.
Continuity mistake: In the flashback, Gator has three trucks at first, but when he conquers his fear and crosses the bridge, he has a fourth one.
Factual error: The "Italian" police wear obvious fake uniforms, they're US style.
Continuity mistake: The dog the boys were trying to catch was facing the fence with his nose very close to it. After one of the boys threw a blanket (or piece of material) over the dog, the dog was facing them instead of the fence. Also, the dog was not as close to the fence and the background didn't appear to be the same. (00:06:07)
Continuity mistake: During the "Perfect Puppy" silly song, Bob places a newspaper he had been reading on the couch beside him when Larry starts singing. When Bob shows Larry the picture of the dalmatian, the newspaper has vanished. When the shot cuts back to Bob, the newspaper has returned. (00:16:55)