After a police-involved shooting, Penny turns in his gun. As he is leaving the scene, he is in the alley where the suspect jumped from a window, and his gun is clearly holstered. Moments later, at the suspect's car, the vlogger (Ava) notes that he has no gun in his holster.
Seconds after the little girl in the cemetery is pulled from the box of water, her hair, clothing, and skin are completely dry.
After Ava's car flips, she's no longer wearing her AirPod, which she's been wearing for the whole movie up to this point. However she continues to hear Clover as if it was still in place.
The police helicopter seen in the beginning changes between shots from being white with some blue to being all blue, several times.
When the 1st kidnapper is shot by Penny in the alley, his hand with the gun lies on his legs, in front of him. In the next scene, his hand is on the left of his body and then again, as Penny approaches, the dead kidnapper's hand lies again in front of him.
Ava says her Fiat 500 is zero emissions so it is a 500e; however, when the 500e flips over after avoiding the truck, it reveals an exhaust pipe. The 500e is electric and doesn't have an exhaust pipe.
At 30:38 when Officer Penny breaks the driver's side window on the suspect's car, the window breaks like regular old plate glass. Car side windows use tempered glass, so when broken they don't create large jagged sharp pieces which can easily cut and injure occupants/pedestrians, but rather they break up into thousands of tiny cubes and are far less likely to cause serious cuts and abrasions. Tempered glass is also a lot harder than plate glass.
The police would have searched the kidnapper's brother and disarmed him before putting him in the ambulance and have had an officer in the back with the suspect.
At 1:02:43 Ava dives four stories into a pool of water. Less than a minute later her iPhone 6/7 is still live-streaming and not affected by the water in any way.
When 4 Police cars converge on a Aaron, there are about 8 cops to take him in, Then the shooter shows up and about 3 cops get immediately shot by the suspect, then there are no other cops in sight, looks like they got out of there quickly.
When Ava and Officer Penny are in the dark hallway of Bunny's building, there's a closeup of Ava's phone screen. It shows it is only recording a video using the iPhone's native video recording mode. Hence, it is not live streaming on, what appears to be, an Instagram or other social media platform.
When the villain is sitting on a bed loading AR-15 magazines, you can clearly see that all the primers are dented, indicating they are expended rounds. This was a close-up shot; it's very obvious.
You can see from many time stamps that the official police closed the streets with police cars and cones for the filming. for example 11:34, 12:34, 32:54 and 58:03.
Seconds after the little girl in the cemetery is pulled from the box of water, her hair, clothing, and skin are completely dry.