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Continuity mistake: When Triton lowers his trident to change Ariel into human, Sebastian disappears, only to reappear later on.

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Continuity mistake: After Ariel marries, the rope with which Sebastian knocks out the chef suddenly appears.

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Continuity mistake: When Ariel marries, all the guests on the boat suddenly disappear.

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Continuity mistake: When the movie starts, Sebastian conducts the orchestra and his baton switches hands between shots.

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Continuity mistake: During Eric and Ursula's wedding, the carpet swaps from being plain violet colour when they walk towards the Minister, to having flowers painted on it when Vanessa transforms back into Ursula.

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Continuity mistake: On the boat, when Ariel goes back to being a mermaid and Ursula cries "Too late!", the whole decoration behind (ribbons, laces, bouquets, book stand, etc.) disappear.

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Continuity mistake: Between the moment when the dolphins attack Ursula and when Scuttle does, a fallen table and the mess around appear/disappear/reappear between shots.

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Continuity mistake: The bookmarks in the Minister's bible keep changing colour between shots.

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Continuity mistake: When Eric and Ursula are about to marry they stand inches away from the Minister. When the birds attack her, the ground-level shot shows nothing two meters ahead of them, therefore the Minister and his book stand have disappeared.

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Continuity mistake: At the lagoon, when Eric finds out Ariel's name, the oars and the outriggers disappear.

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Continuity mistake: When Ursula's necklace breaks and Eric runs to Ariel, the stool on which the Minister stood on disappears.

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Continuity mistake: The Minister's cape lays sideways first, and straight behind him in the immediate angle.

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Continuity mistake: When Eric's boat leaves with Ursula in, there are ribbons and a long piece of fabric decorating the side of the boat by the 2 portholes, which disappear in later shots.

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Continuity mistake: The barrels that Sebastian uses for Ariel to float and swim to Eric's boat weren't there in any previous shots, and simply pop-out of nowhere.

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Continuity mistake: At the pond, Scuttle jumps on a branch that ends in 2 branches, plus a third one cut. When the angle changes, that third branch is fully grown and filled with leaves.

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Visible crew/equipment: When Costello shows Billy the mutilated hand in a bag, filming crew members standing up are reflected on the wine glass.

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Continuity mistake: After Scuttle finds out that the girl is Ursula, he flies to tell Ariel. From the aerial angle she, Sebastian and Flounder are gone from the pier, only to reappear a frame later in a closer angle.

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Continuity mistake: When Ursula stabs her bobby pin on the mirror it falls backwards. When the angle changes it's straight, then she steps on the make up cabinet and it's back to tilted backwards.

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Continuity mistake: When Scuttle peeps on the porthole and discovers Ursula, the design of the porthole changes style between the first and last shot.

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Revealing mistake: In Eric's cabin, when the young girl reveals herself to be Ursula, she starts to dance. Watch her right foot and you'll notice that it's blending and going through a green box as if it were not there.

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