- Continuity: When Soto describes his plan for bringing down the mammoth, Zeke and Oscar swap positions between shots.
- Continuity: During the fight with the dodos, Diego disappears when Manfred is keeping the melon away from the dodos. When the melon goes flying, Diego is back beside Manfred.
- Continuity: In the first shot of the human camp, the camp is on the left side of the river that leads to the waterfall. During the tiger attack, the camp switches places to the right (note where the baby's mom jumps).
- Continuity: Sid's position beside the fire changes when his tail catches fire.
- Continuity: Sid steps in poop with the first step he takes, but in the previous shot, there is nothing within two steps of him.
- Continuity: In the first camp-out scene with Diego, Diego is sleeping close to the rock wall when Sid returns. There is an overhead shot, and he is only a few feet away from Manny and Sid. Later, in another shot, just before he gets up, he is back by the wall.
- Continuity: When Roshan is crying and they're trying to figure out why before the melon scene, Sid picks him up after the notion of BM is mentioned. When he says 'Why am I the poop checker?' he spreads his arms, and is no longer holding the baby. The camera wasn't on Manny long enough for Sid to put Roshan down.
- Anachronisms: Animals, from many different epochs and continents, mingle in 10,000 B.C. North America.
- Continuity: During the sliding scene, Manny slides through some spikes on a slab of ice right after Roshan, who, weirdly enough, got through it unharmed.
- Revealing mistakes: When the sabertooth pack is chasing Sid and he "skis" away, Sid is kicking up powder and leaving tracks in the snow, but during the early stages of the chase, his pursuers are running across the top of the snow leaving no tracks.
- Revealing mistakes: Just before Sid comments that his "feet are sweating" there is an overhead shot of all three main characters walking along the snow. Their feet are moving but their bodies are moving forward far faster than their steps would take them and they appear to be sliding forward on the snow.
- Revealing mistakes: The first animal to step on Scrat in the opening is a mammoth, yet no mammoth is visible in the long shot of the crowds of animals. In fact, no mammoth other than Manfred is seen throughout the sequence. With this, a large bird also steps on Scrat, but no birds are seen in the crowds. We also only see two legs of each animal stepping on Scrat even though three of them are quadrupeds.
- Factual errors: When Scrat's coconut falls from the tree, it has already had its husk removed. (The directors confirm this on the DVD commentary. They may have been worried that a lot of their audience would not recognize a coconut with its husk on.)
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: At the end of the movie, Runar places his wife's necklace on Manfred's trunk. A few moments later, the necklace has disappeared.
- Factual errors: SPOILER: At the end of the movie, Scrat is seen frozen in ice. The ice is floating on the ocean with 90% above the water. The ice should be lower in the water with only a small fraction above the water line. Only a huge wave would then be able to wash Scrat onto the beach.
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