Continuity mistake: In the canoe ride down the hill, the oar outside the left of the canoe makes the canoe turn right to avoid the tree. Scraping the group to the left would cause the canoe to turn left.
Continuity mistake: Near the end of the movie, when the helicopter sets down on top of a tall building, the registration mark of the aircraft changes noticeably several times, from G-ORMA to G-ICSG and back again.
Continuity mistake: The first movie shows Santa slipping on the roof and kicking up a white snow blanket as he falls. The flashback in the third movie does not show the blanket being kicked up as Santa slips.
Continuity mistake: During one of the first times Katy mounts Flicka to ride her, Flicka isn't wearing a harness, yet in the next shot she is.
Continuity mistake: In the first 'Ice Age' Diego isn't afraid of water (in the beginning he chases the woman and the baby through the river before she jumps off the waterfall and never shows any fear) but in this one he suddenly is. It's not like that he is just afraid of swimming because in the second movie he shows fear anytime when he touches water.
Revealing mistake: Just as the bus begins to roll down the mountainside, cables are visible which were holding the bus in place. Most easily seen during the first complete rollover. (00:05:45)
Continuity mistake: In the end, all the pictures in the cousin's book are normal, but earlier Leroy tore Xs in each.
Continuity mistake: When Mumble is still a baby, his "bowtie" does not appear until Boss Skua has him pinned down under his foot. Then shortly after, it disappears again, only to reappear when Mumble falls into the crack in the ice.
Continuity mistake: When they are auditioning for the team, they stamp the fat kid's file "approved" under his photo parallel to the bottom edge. The camera cuts away and back to show the stamp at an angle with part of it on the photo itself. (00:13:40)
Continuity mistake: When the Officer David Delinko and The Captain are having some lunch in the seafood restaurant, the cups on the table move about between shots during the scene.
Continuity mistake: When Helena is fighting all the guards on the staircase, there are knocked out guards and a samurai sword lying directly behind her foot. In the next shot, they are all to the side so that Helena can run down the steps.
Character mistake: In the training room, after Randall is discussed as the record holder, the students are brought to attention. All but one is standing at attention, he is in the back on the right hand side, standing at ease.
Continuity mistake: When Hornet is pretending that Victor is trying to kidnap her, she lets go of his jacket to get away. In the following shot, she is seen letting go of his jacket again.
Revealing mistake: After Raye has finished writing down the agent's names onto the piece of paper on the subway, the "dead" man next to him can be seen swallowing. (00:57:30)
Continuity mistake: In the opening scene, two people are dragging a coffin through the desert. After first seeing only their boots, when we see the two guys, the one wearing a white shirt is on the left, and the one with a red shirt on the right. But in the very next shot their positions have changed, now the man with the white shirt is on the left while the one with the red shirt is on the right.
Continuity mistake: At the amphitheater, just as Boog chases Elliott through the curtain and off the stage, the dark colored paint that was splashed across the back of the curtain only moments before is not visible when Boog and Elliott pull the curtain down upon themselves and neither of them have any trace of paint on them after they roll free of the paint-splattered curtain.
Deliberate mistake: When Hellboy is attacked by the spider-lady, as the spiders begin to descend on him to steal the sword, you can easily tell that some of the shots of the spiders coming down are repeated 2 or even 3 times, and simply flopped horizontally to appear different.
Continuity mistake: In the scene where Thor hits Hulk with his hammer, he swings it, but in the next shot it shows him with his arm extended as if he hit him with his fist. (01:01:45)
Continuity mistake: Arthur had only 36 hours to spend in the Minimoy world, and he leaves at midnight. He spends a full 24 hours too long as a Minimoy. After he finds the Minimoy Princess they travel during the day. They spend the first night sleeping in a flower (24 hour mark); the second night he is wandering under the house, the grandma is sleeping in a chair above him (48 hour mark). He then returns at noon. That's 60 hours.
Continuity mistake: When Ted is using the kite to steer the balloons, he is holding the string in his hand. When George's balloons pop, Ted catches George, and both of Ted's hands are seen to remain empty for at least 15 seconds, no kite or string is seen at all. Then it immediately cuts to a wide shot after George climbs onto Ted's back, and Ted is suddenly holding the kite string, and we see him continue to use the kite to steer the balloons. Ted did not have time to tie the kite string anywhere else, as he had it in his hand as he reached for George.