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.
When Farmer Hoggett is shearing sheep, it is morning and lunchtime. However when he piles the fleeces on the wagon it appears to be sundown. He then continues his shearing with the sheep, and also giving Babe a chance to drive them out of the pen.
When Farmer Hogget goes outside to inject his dog with a tranquilizer, he injects the serum under the dog's skin. In actual fact, tranquilizers are given to animals in the muscle on their backs above their tail.