Continuity mistake: At the beginning of the movie, Cass is blackmailing Mira about the true nature of her little trip. She calls Liam up; during the scene, she is holding the hanger in a different way between shots (left hand on the hook, or under it). (00:04:00)
Factual error: Following the blowout, Sara's phone is shown several times as being connected to Wi-Fi with a full Wi-Fi signal. Being in the middle of nowhere, surrounded by hills, it's highly unlikely there would be a public Wi-Fi connection for her to connect to.
Factual error: The man cutting through the door is pictured holding a torch, but that type of torch is not a cutting torch. You also see a showering of sparks as though a grinder is being used. (00:42:00 - 00:43:00)