In the scene with George swinging from the Golden Gate bridge in San Francisco, that's actually Brendan Fraser, not a stuntman. He enjoyed the rush so much that he requested an extra take just to swing again.

Brendan Fraser auditioned for the role, but wasn't going to get it. However, he'd brought his dog along to the audition and it was behind the sofa. When it started barking at the end of the audition, Brendan leaped over the sofa and started barking back at it on his hands and knees. They offered him the part immediately.

In what must have to be the subtlest type of product endorsement in film history, check out the fireplace when Ursula is telling her parents about George. The scrollwork on the top (with a Medusa's head and even the alternating zigzag pattern) is the design for VERSACE.

The tree house and the immediate area around it were all created on a big set for the movie.