When the murderer just shot the police officer, the other girl is just about to shoot her out the window. When the murderer girl is just about to be shot and just about to fly out the window, she screams. You have to look at the wall really quickly and you will see a girl in a blue bikini and some else standing next to her. It is like coming from a projecter! Look closely!
This isn't a slip-up! You're right about it being a projector shot. Remember when the "murderer girl" was showing the other one the photos of her boyfriend (the one that the girl accidentally ran off the road with the chic from the past). This is the whole reason the "wacko" went off killing everybody in the first place. So yes, it's a picture of her and her boyfriend that she was showing just before she went to try to take out the girls kidneys, but no, it's not a slip-up.
But actually there is a slip-up. Recall when she was giving her shpiel (sp) to the girl when she was tied down on the bed. Take a close look at the slide on the wall. After the action scene and right when she's at the window, the slide is on a different one than the one she left it on. I guess she had time during the combat to change back to the slide of her choice.
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