Other mistake: When the detective sends the traffic cam footage, a Gmail alert pops up. However, the dad is currently using Margot's computer, not his. He previously logged into Margot's gmail account on this computer so any alerts received would be Margot's mail, not his.
Continuity mistake: After David has sent his daughter texts asking since when does she not text at school, it shows he's in a video conference with some other people split onto 3 screens on his computer. The image of his boss above and the image of the 3 people to the left of David's video never changes. However, upon cutting to closer or further angles of David's video, it frequently switches back and froth from a mirrored image or not. Despite there being no reason for it switching depending on the movie's camera. (00:15:40)
