Corrected entry: When Joe walks into Orbison's office to tell him that he is quitting, Sancho is in the room being interviewed. Yet later, Joe doesn't recognise him when him and Ben are in Orbison's house looking for Lisa.
Corrected entry: When the porn stars are preparing for the DVDA shot, you can see that all five actors are white. But when it cuts to Joe watching the scene being filmed, you can see a pair of black legs in the air.
Correction: Actually that is the woman's stockings that you see in the air, not a black person.
Corrected entry: When Lisa comes back to Joe's flat to talk to him about the argument, she puts her suitcase on the ground next to the door. But when Joe comes back later in the evening, her suitcase is no longer outside. Where did it go?
Correction: Somebody leaves a suitcase outside a door, and then wonder where it went? People steal things all the time if left unattended. It could also be that someone thought it was garbage and threw it away, there's tons of reasons a suitcase would not still be by the door a few hours later.
Correction: When Lisa goes back to the apartment, she puts the case down on the left-hand side of the door outside (she's carrying it in her left hand and puts it down with her left hand), and it's possibly still there when Joe comes back that night, but it would not be readily visible because when Joe walks in, only the right-hand side is shown behind him. Also, the fact that he calls for her indicates the case is still there, but he's confused as to why it's outside.
Correction: I see hundreds of people a day at work, I likely wouldn't remember them seeing them outside the context of work, either.