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A fairly meta example; the fact that Lenny's father is clearly supposed to be the bad guy in not accepting his son wanting to be a 'dolphin'. Metaphors for GLBTs don't occur in kid movies very often, if ever.
Technically, the problem between Lenny and his dad was that the former was a vegetarian, which leads to a good bit of fridge logic concerning how Lenny hasn't starved to death.