Director Alan Shapiro originally wanted 'an entirely unknown' for the role of 'Kim'. However, felt that most of the girls that screen tested with Elijah Wood were too 'giggly'. He decided to cast someone with more experience.
When Sandy is swimming underwater with Flipper after being knocked off the dock while working, his watch and armbands flip hands during one scene with his watch on the right wrist and armbands on the left.
Often throughout the film the dolphin is referred to as a 'she' when it is supposed to be a 'he'. Most notably is when the dolphin is poisoned and getting him onto the stretcher.