If you look in the page history it says that (someone must of removed this text):
Note: *denotes anachronisms; these characters (or, in the cases of characters such as Tinker Bell and Marvin the Martian, the animated versions of them that appear in the film) were created and/or first appeared after 1947. But as screenplay writer Peter S. Seaman said, "The aim was entertainment, not animation history." There were a few notable Golden Age characters such as Popeye and Tom and Jerry missing from the movie due to legal copyright issues.

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