When the killer chases Maxime and Babette in the kitchen, both their caps fly off and fall on the table, but in alternate shots, they lie on the floor.
During the struggle in the shower cabin, Mirte loses her cap and Tamara does also 5 seconds later. However, in the split-screen-shot of Maxime and Babette, both caps fall down at the same time.
Jessica her hat falls off as she tries to lift up the wardrobe from Kristel. She puts it back on with the logo forwards, but in the next shot, the logo is on the back.
In the mid-shot of Amber rubbing Mirtes hair, Mirtes shirt is up and her bare belly is visible. In the next close-up, her shirt is suddenly down.
Halfway through the pie fight, one of the flower vases is knocked over. In the end, it stands up again.
The girls are watching the arrival of Kristel through a keyhole, but they're all sitting at a way too far distance from the door to see anything.
When Agent Sanders is thanking the girls, you can hear that his voice is later dubbed. He whispers the sentence, while his facial expression indicates much more volume.
When Amber is climbing down the window and notices her feet are stuck, you can clearly see the top of the microphone in the left corner.
When the girls are scared by Ambers first appearance, you can see the wires pulling up their caps.