At 45:16, Anna puts 2 dots in her signature. When the camera focuses on the contract, there are no dots in the signature.
In the 20th minute, the rear passenger window of Anna's car appears tinted pink. All other windows are normal except for the rear windshield which is clearly tinted and appears black from the outside.
In the 52nd minute Anna is heard dropping to the ground as Ray turns and walks away, then one sees a further away shot of Anna in the background standing against the closet before falling to the ground.
In the 6th minute while Ray is speaking to his now-freed kidnap victim, from the back of Ray's head his lips are clearly not moving.
In the 52nd minute when Ray swallows Anna's car key fob, from behind, his head is moving as if he's still speaking but he isn't talking.
When Ray greets the police officers at the front door of his mother's house, the police have badges and radios attached to their uniform, but no officer names, insignia or the word 'police' anywhere on their uniforms.
At around 15:45 Ray is sitting at a table with his computer. In the background on the wall near the curtain is a piece of hardware called a "holdback", meant to hold the curtain when it is pulled back away from the window. It is mounted incorrectly. The hook should face concave toward the left.
When Ray is speaking with Natalie in their mother's house about Anna bound in the basement, he says to Natalie of his client that she is paying big bucks for "a simulator experience." It's not a simulator experience, but a 'simulated' experience.