James Cromwell was a long time vegetarian, but decided to become vegan after playing Hoggett in Babe.
Babe is a male character, yet many female pigs are used in the film, as evident when Babe walks away in many scenes.
When James Cromwell was handed the screenplay for Babe, he thumbed through it to see how many lines he had. He saw that he didn't have that many, he decided that he would do it as a nice easy film. What he didn't realize was that he would have more screen time in this film than any of his previous films, just not that many lines.
The talking pig is a combination of 48 real Yorkshire pigs plus an animatronic double. A makeup artist added toupee and eyelashes to each, and computer digitization manipulated pictures of the snout to make the pig appear to talk.