Other mistake: When Amanda's driver brings her to the cottage for the first time, he tells her he can't drive her up there because he would not be able to turn around, but the same driver picks her up at the cottage when she is leaving and presumably has no issue turning around at all, and you can see it's a flat field in front of the cottage.
Other mistake: The wrong flag for Poland is shown when Amanda s going through the exchange countries at the beginning of the movie.
Other mistake: In the beginning scene when Amanda throws the first shoe at him it ends up behind him in the middle of the hallway. When she throws the second shoe at him it ends up at the top of the stairs where all of a sudden the first shoe is. When he enters the room there are no shoes at all. They even walk down the stairs without picking up his shoes.
Answer: Iris only turns on one burner without lighting it. When the Internet tone for getting a message sounds, Iris comes to her senses, turns off the unlit burner, opens the window and then answers Amanda's message.
ChiChi