When a girl falls from the balcony at the start of the movie, she is shown landing face first, but was shown falling her back being turned to the ground.
When Nancy stuns the killer and runs, her left sleeve is shown cut, but in the previous shot of her it's in one piece.
When Melody runs to the pilot to wake him up, he is sleeping in his sleeping bag and is startled by her. In the next shot of her continuous cries for him to wake up, he is out of the sleeping bag.
When Ralph enters Nancy's room and starts talking to her, in one shot he is shown just beside her, when in the very next shot he crouches next to her to be there in the first place.
At the beginning of the movie, the "victim" falling from the balcony is obviously a dummy.
The killer kills one of detective's men by axe using just one hand. This would be really hard to do due to the heaviness of the axe and the need to put the force of your whole body to use the axe properly.
When girls go to the air strip to welcome the boys, it is supposed to be night, but it's clearly day. After that point it happens almost in every scene where people are supposed to be outside during the night, possibly due to difficulties concerning the lightning.
Obviously fake head when woman is decapitated by an axe.
One of detective's men who gets killed in Leia's room can be seen moving while being dead when he is found by the group.
Mr. Ronsoni opens the door in the kitchen to leave at approximately 15:14 to reveal crew standing behind brick support column of porch.