Continuity mistake: In the carnivorous plant scene, Manny grabs the fruit (the bait), which is sitting in the middle of the plant. In the next few shots, the bait disappears and then is replaced with a bulb that housed the red and blue "wires".
Continuity mistake: In the beginning, Scrat is sniffing for his acorn and reaches the end of the cliff. Before he reaches the end, look at his saber teeth closely; they've disappeared. When his nose goes over the edge, they reappear.
Continuity mistake: In the end of the plant scene, Buck agrees to help them. He throws his knife into the ground before he explains his rules. When he's telling his rules, the knife is gone. When he's done telling his rules, it's back and he picks it up.
Continuity mistake: In the scene where Buck tells about his encounter with Rudi, you see Buck swing back and forth on the gross pink thing. The next scene in the cave he is still swinging, "back and forth" but he's not hanging from anything.
Suggested correction: He is standing on his feet all this time, I recommend watching the movie.
Continuity mistake: When Buck recites his tale of how he lost the eye, he covers his eye with on hand (paw) and run up a bare tree. There are no leaves in the vicinity, and there is nothing in either hand (paw). But reaching the top, he ties the eye-patch.
Suggested correction: He landed on the ground where he could possibly grab a leaf. How he got it up the tree is still inexplicable.
Continuity mistake: From a significantly far distance, Sid is seen rolling one of the dinosaur eggs to the other two and is originally seen on his way to push the egg to left side of the other two, but is instead seen pushing the egg between the other two in the following shot. Also, in the initially mentioned shot, there is no downhill slope to the left of Sid and the eggs. But magically, one appears right next to them two shots later. (00:12:15)
Continuity mistake: When Crash and Eddie faint, Ellie's trunk is tucked away like Manny's trunk, then when Ellie says, "I thought those guys were extinct," Ellie's trunk is now in front of her.
