When the police first arrive at Blake's house they are in a Kia Sorrento police car. They then leave and it has been replaced with a BMW.
Correction: When Toby is hiding in the closet the grate is on the side of the closet not the door.
When Toby was hiding in the closet there is no grates. But moments later were shown from inside looking out.
Getting the MAC address off the router, in order to disable it, is clever, but usually there's a reset button that has to be pressed at the same time, in order to reset it.
At 26:05 film crew are visible in the reflection behind the judge as he walks into a small corridor.
The killer murders at least five people in this movie. His MO is to bring them to his house, when he does so. So that's five disappearances, and at least five people whose mobile phones' cell tower traffic would have led to Blake's residence.
The detective that was following black just give up after he provokes her, for no reason. She had a LOT of evidence and got a lot more and yet she gave up. She had the phone last location of Toby being on Blake's street, the connection between Blake and Toby, the foreign guy leaving the house after being drugged, his follow disappearance, his suddenly house sale, she had like a TON of evidence to be on his track, but she just let all behind.