Other mistake: At the end of the movie, at Glacier Pass, the clouds are lit in such a way that it indicates the sun has set in front of the animals AND behind them.
Continuity mistake: When Diego, Manny and Sid are chasing the kid in the ice tunnels. They are right behind the kid. But when the shot shows the kid, the other 3 are nowhere to be seen.
Continuity mistake: The ice glaciers that come together to form the one that Scrat got launched from were both the same except for one facing the other way, but they come together perfectly.
Continuity mistake: Manfred, Sid and Diego decides to rest after having set up camp in a shelter; Sid, being right next to Diego to Diego's right, transitions from sitting to lying down, and in the next shot has disappeared. (00:57:25)
Continuity mistake: When Diego falls to the ground after Soto injures him, he lies on the ground right in front of Manny. But later, he is seen lying further away from Manny.
Continuity mistake: 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 mistake: When Lenny and Oscar witness Soto's death, they are standing next to each other. But, in the next shot where Manny looks at them, Oscar is standing further apart from Lenny. They stand next to each other in the next shot, but in the shot where they flee, they're standing apart from each other again.
Continuity mistake: When Sid is relaxing in the 'goo' and has it splattered on his face (no-one knows what it is), he wipes his face off with Manny's trunk, none disappearing. In the next shot, the 'goo' has completely disappeared from Sid and the baby.
Continuity mistake: At the end of the movie, where Manny returned the baby, and received the talisman from the human, it was hung from Manny's tusk. As they meet Diego and walk away, the talisman isn't there anymore.
Audio problem: The baby babbles during the scene when the group travels through the cave with the drawings, but his lips and mouth don't move.
Answer: The sequels take place before he was frozen.
MasterOfAll