When that French-Canadian girl meets up with Peter (Chris O'Donnel) and shows him her broken finger, if you look at it closely, the broken fingertip is just added on.
Well, I can see how that would make the break seem more fake, but then again, everyone knows it is fake. Would you expect them to actually snap the tip of her finger? If not, I don't see how else they could make it seem broken.
I've had a broken finger before and you can't just fix it up and expect everything to be normal again by pulling it. It's extremely painful breaking a finger, and you cannot just snap it back in place. My finger is still bent out of shape. A slip-up there.