Chris Wedge, director, is the voice of Scrat.
Movie signage and the book version include a female sloth named Sylvia, who is not seen in the released movie. In the book, Sid manages to avoid accompanying her on the migration south, because she is interested in a commitment.
James Earl Jones and Ving Rhames were originally considered to play Manny.
Chris Wedge regrets that he didn't get the bunny from his short Bunny (1998) into the film as an easter egg.
The film was originally intended as a drama but Fox would only accept it as a children's comedy.
The first movie produced by Fox Animation since Titan A.E. (2000).
The production team originally thought of turning the 20th Century Fox logo into ice when it appears before the film. Even though it can be seen in one of the trailers, they cut that out and placed the regular logo in the film.
The first drawings seen in the cave (before entering the giant area with the mammoth drawings) are replicas of the earliest known cave drawings, found in Lascaux, France. They have been dated at somewhere between 15,000 and 17,000 years old.
John Leguizamo tried a variety of different talking styles for Sid; after seeing a model of what Sid was going to look like, he came up with Sid's lisp.
The baby's name is apparently Roshan.
When Sid, Manny, Diego and the baby are walking through the ice cave, they walk past a UFO frozen in a block of ice, as they walk past, the baby does the Vulcan hand salute (from "Star Trek" (1966)).
All the actors were encouraged to improvise as much as possible to help keep the animation spontaneous.
The human characters never talk in the film.
Scrat was only supposed to appear in the film's opening few minutes, but he proved to be such a popular character with test audiences that he was given more scenes.
Pre-production took over a year before any animation occurred.
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