Continuity mistake: When Diana Hyland kicks the box across the floor, she has nothing in her right hand, which is the hand that holds the bottle in the previous and following shot. (01:12:15)
Continuity mistake: Stephanie holds the Squaw Lake shirt that Diana Hyland threw at her; she holds it in close-up with her hands well apart, stretching it. In the wider angles though she holds it with the hands closer and supporting it with her forearms. (01:12:25)
Continuity mistake: Inside the McLanden residence, Stephanie sits in front of the mother and starts "Your daughter Faith..." Jean Smart 's hand is in front of her face, but it's in front of her chest at the cut. (01:16:55)
Revealing mistake: Stephanie is browsing on the library computer the copy of The Cherry Creek Observer. On the page at the right end of the screen you can see under a title about an assault, a copy-pasted article about autism. (01:20:20)
Continuity mistake: When she's having martinis on Emily's gravestone, when it's Hope's turn to serve them Stephanie walks around the tomb; the lemon twist is in a different spot of the glass between shots. (01:28:55)
Continuity mistake: When Blake Lively's body double runs through the patch of woods towards the lake, the sole of her feet are entirely covered in dirt. When she jumps from the pier though, her feet are much cleaner. (01:33:35)
Continuity mistake: The bloodstain on Sean's shirt is different between the close-up when Stephanie checks on him and when he stands again. (01:45:50)
Continuity mistake: When the SWAT team bursts into Darren's house, he puts his hands up, holds nothing, and yet somehow the packet of crisps appears on the table by him. (01:47:20)
Continuity mistake: After the police raid at Darren's, Emily is talking while she moves the gun around. During certain cuts ("manipulate the system", "I mean, sort of perfect", "f**king crazy, haven't you?") she has her gun tilted in opposite directions. (01:47:30)
Continuity mistake: When the villain runs away after shooting Sean, in close-up Sean is sporting a lot of blood that spreads quite a bit around the entry wound. When Stephanie runs after them, Sean's wound has just a single trickle. (01:49:10)
Continuity mistake: In the final confrontation between Stephanie and Emily, the shadows on the asphalt change radically (full sun to full shadow) during the sequence. (01:49:20)
Continuity mistake: Stephanie shows Faith the tiny camera that is live streaming her confession at the end. Faith starts running away and we see the feed from the camera on Stephanie's chest move forward. Cut to Stephanie who is stationary, but then starts to move.
Other mistake: Emily does not let people take her pictures, but she obviously has documents - she signed papers and has a driving license - and also has a husband quite fond of her who spends ages sucking face with her. With all that considered, nobody picks up on the obvious fact that her mole (which is in a position that would show in every mugshot) switched sides.
Other mistake: The vlog entry that leads to the finale is #47. Six months pass, the caption say, but in the finale Stephanie is posting her vlog #290. That's more than 40 entries per month, and Stephanie always keeps her entries daily throughout the movie even under the craziest circumstances.
Other mistake: Stephanie's vlog gains over 85,000 subscribers in the space of the minutes it takes for her to livestream from her home to Emily's house. While Youtube has had much larger sudden increases in followers, this is not Youtube, but a private blog that begins from 34,000 subscribers. It seems quite unlikely that even by word of mouth it could have the critical mass to grow by 200% in such a short time, considering that it reached those 30k with a murder story that had media coverage, and it takes then 6 months for her to hit 1 million afterwards, with the amazing scoop and juicy media story that follows. It should also be noted that her figures when she asks to identify the Kia are ridiculously low; she manages to find the same car the police can't find thanks to her channel that has a whopping 1,013 subscribers worldwide at the time.
Other mistake: Bashir Salahuddin appears in the ending credits of the Italian localization as "Detective Summervile" with one L. It's a spelling mistake that appears also on IMDB, so one wonders if the localization team lifted name from the website, or if the theatrical version had the spelling mistake and was fixed afterwards.
