Knock Knock (2015)

Factual error: In the end credits, when the listing of songs used in the film is rolling, the Kiss song is listed as "Detroit City Rock." Actually, the song title is "Detroit Rock City." (01:38:10)

Belasko44

Louis: Bitch, you barkin' up the wrong fucking tree. I'm from Oakland, ho. I know two ghetto ass hoes when I see 'em.

Question: How did Bel and Genesis know about the conversation Ethan had with his family before his family left for the beach? He asked them were they spying on him, but the conversation was in the house. How do they know what was said?