Continuity mistake: When the girls are leaving the Statue of Liberty the first outside view of the ferry is white and says "N.Y. Waterways." When they show the second outside view it is a red ferry with no title.
Continuity mistake: While on the 7 train, when Fin looks out the last car's window and sees the flooding and oncoming sharks, as he shouts, "We're in trouble!" in the closeup we see the door has certain stickers and markings and there's an advertising poster on the wall, but when it cuts to the wide shot it's all changed.Super Grover
Continuity mistake: After April sneaks out of her hospital room, it cuts to the taxi with Fin, and the cab pulls over to the curb at the corner of Broadway and West 48, but in the closeups they're in an entirely different area - note all the buildings, then in the wide shot they're back on Broadway.Super Grover