Factual error: Another problem with Speckles the star-nose mole. Star-nose moles live in "wet lowland areas" (Wikipedia) but in the film, Speckle's history is shown and his home used to be a field with undulated small hills.
Factual error: When Mooch is leaving the pet shop he goes through a bunch of Venus fly traps and they instantly snap at him. Venus fly traps don't close their leaves instantly, they wait for the prey to land and move around, closing tighter the more the prey wiggles.