a 'goof'? really? (spoiler)
If you look in the Goofs for this movie, you'll find this:
Factual errors: At the end Draguta and Rusty have a baby who (a) is a hunchback and (b) has hair similar to Draguta's father's. But since Draguta's head has been transplanted onto one of the sisters' bodies, the baby should have no genetic material from Draguta's side of the family.
Really??!??? *This* is the thing you found to be inaccurate? or unrealistic? or unlikely? This??? Nevermind the decapitated head that lives on, or the whole idea of transplanting a head to someone else's body, or a soul that comes and goes with the opening of a music box, or any of the other zillions of ridiculous things in this movie? *This* is the one thing you felt compelled to post about?!
Wow.
Meanwhile...I thought the whole movie was hilarious in its awfulness. Thoroughly enjoyed it.