Deliberate mistake: When Eric's ship blows up, his statue bobs up and down. A statue this weight would not be able to bob up and down for even a second. It would just sink straight to the bottom.
Deliberate mistake: While trying to rescue Ariel at the end of the movie, Eric harpoons Ursula's arm, leaving a black cut. But in the following shots of Ursula, the cut is gone. (Due to Disney's practice in not leaving injuries onscreen).
Continuity mistake: At the start, when King Triton makes his appearance he's holding dolphin reins, and at first it's shown as two separate straps in Triton's hand as he tells Sebastian he's looking forward to the performance, but when Sebastian replies that it will be the finest concert he's ever conducted, Triton lets go of the rein and it's a single continuous strap. (00:04:15)
Sebastian: Are you sure about this?
Scuttle: Have I ever been wrong? I mean when it's important.
Trivia: The two minute storm took 10 special effects artists over a year to finish.
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Chosen answer: They are all throughout the film but the biggest one is when Eric is steering the ship to stab or skewer Ursula.
Disney-Freak