In the scene where Annie's cabin was booby trapped by Hallie...when Annie gets up and the balloons fall, as the last big one is falling you can see the tack in her hair to help pop the balloon so she doesn't get hurt.
Okay, this may be a slip-up, but they admitted to it. If you watch the movie surfers go inside or some show like that, the actress that plays the twins tells you that they had to put a tack in her hair. So...
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