Continuity: In the scene where flipper knocks Sandy in the water with his tail, Sandy is fixing the deck and we see his bare feet, but when he is falling into the water, he has black water shoes on.

Continuity: In the scene where Sandy is waiting for the ferry, he is playing on his Gameboy. When he sees Flipper, and tosses the can in, you can see he is still holding the Gameboy. However, when Flipper throws the can back Sandy catches it with both hands and is no longer holding his Gameboy. After he drops the can, we see that the Gameboy is back in his hand.

Continuity: When Sandy (played by Elijah Wood) is hit in the butt by flipper, and then falls in the water, look carefully at his hair when he is treading water. At first, it is neat and wet back, and then a few seconds later at is all messy, and sticking up.

Continuity: In the scene where Sandy first comes to the island and goes to Porter's house, watch his shoes. When he is walking on the beach he is wearing white tennis shoes and still is when he knocks on the door. In the next shot when he plays three notes on the piano he has on black sandals. A minute later when he later walks out on the dock to find Porter he has the tennis shoes back on.

Continuity: At the end when Sandy is telling Flipper to swim away, it shows the top half of Sandy's body. One of his arms is on a rail on the side of the boat. It then cuts to show Sandy's legs and Flipper. Now both his arms are suddenly by his side. It cuts again to show his top half, and his arm is magically on the rail again.

Continuity: When Sandy, Kim, Porter, Cathy, and Marvin go and look for the site where Dirk had dumped the poison in the ocean, watch Sandy's shirt. Throughout the sequence Sandy switches between two shirts when it is the same day.

Other: In the part where Sandy is waiting for the ferry and is playing the Gameboy, if you look closely at the screen there's nothing on it.