Plot hole: When Tails is flying towards Prison Island for the first time, he spots Amy on the island surrounded by enemies after mistaking Shadow for Sonic. There is no explanation given for how Amy arrives on such a guarded and fortified island. When Sonic asks her later, she says that she hitched a ride with Tails in his plane, but she couldn't have, as Tails spotted her on the island as he was flying in.

Bug: In the Chao gardens, Tails can fly right through the GBA shaped top of the Chao Transporters like they don't exist.

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Bug: In Chao Gardens, if 2 or more Chao lay down next to each other, their bodies pass right through each other.

More mistakes in Sonic Adventure 2

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