Continuity mistake: Charlie has set up a "security system" on the right side of the bed. When a double slaps Lindsay's hand, she goes over to a chair on the right side of the bed and the security system has vanished completely. It reappears when she returns to bed.
Scary Movie 5 (2013)
Ending / spoiler
Directed by: Malcolm D. Lee
Starring: Charlie Sheen, Lindsay Lohan, Ashley Tisdale, Simon Rex
In a post-credits scene, Sheen wakes up, with Dom Kolb sitting beside him, from a dream extraction, i.e. the whole movie was a dream. After Kolb informs that Sheen will be sleeping with Lohan, a car crashes into the room, killing Sheen. Lohan is revealed as the driver; she gets out of the car, says to Kolb "You were driving" and throws him the keys, blaming the accident on him.
More mistakes in Scary Movie 5
Lindsay Lohan: I'm gonna blow you across the room.
Charlie Sheen: Sounds awesome.