Continuity mistake: When Ariel goes to sleep in Eric's palace, the candle on the bed table disappears in the last shot.
Continuity mistake: When Sebastian runs away from Grimsby's plate, the second fork on the right disappears, only to reappear in the next angle.
Continuity mistake: When Sebastian falls in the boiling pot, the kitchen swaps from turned off to having huge flames rising.
Continuity mistake: Louis flours Sebastian while holding the bowl sideways by the edge of the table. A frame later, his hand is away and the bowl is laying flat on the center of the table.
Continuity mistake: When Ursula arrives at her mirror, most of the shells on the stands disappear in the second shot.
Continuity mistake: The first time we see Ursula, the oyster keeps changing shape in every single angle.
Continuity mistake: When Ariel grabs the fork the prongs on the side are skewed. When scuttle grabs it, just the one on the right is, the rest look perfect.
Continuity mistake: While Flounder is chased by the shark, moss suddenly appears on the anchor.
Continuity mistake: While investigating the sunken ship, Ariel is about to see the fork, she swims upwards towards a hole where a broken log stands out on the left. When the angle changes, the hole is completely different and the log is gone.
Continuity mistake: When Ariel and Eric lay on the shore, Sebastian is sitting on a rock and his jaw falls, with Scuttle standing by his side. A frame later, Scuttle is standing meters away.
Other mistake: When Grimsby talks about the statue, the sailor behind Eric remains still, no animation at all.
Continuity mistake: When Grisby shows the covered statue, the shape of the bulk underneath changes drastically between shots.
Continuity mistake: When Ariel and Eric exit the town on the chariot, she has her right arm down, but in the close-up it's up and holding a bouquet and some other stuff.
Continuity mistake: Eric sits on the side of the boat wishing to find his true love, between a ladder and a rope. From the opposite angle, where we see Ariel peeping, the rope is gone.
Continuity mistake: Before the maid brings the food, Grimsby puts his glass on the far left of the table. When the angle changes it's standing right in front of him.
Continuity mistake: When the maid scolds Louis for making noise, the blood stain on the wooden door increases between shots.
Continuity mistake: When Louis is chasing Sebastian, all the stuff he breaks disappears when it hits the floor.
Continuity mistake: After Ariel has saved Eric and both lay on the beach, his forehead is clear. When the angle cuts, bangs of hair are covering it.
Continuity mistake: All the sailors running around the deck disappear in the wide angle when the hurricane begins.
Continuity mistake: Eric's statue suddenly disappears from the ship's deck when the storm breaks.
Answer: Yet another Disney urban legend.
Jazetopher