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

Bug: There is a pillar with a ledge over looking the pool in the Hero Garden. On this pillar, there are 6 columns supporting a roof. Sonic characters can walk right through or stand in the same space of the columns, as if they are not even there. Yet the roof is supported by them.

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More mistakes in Sonic Adventure 2

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