Continuity mistake: When Gammy enters the bedroom on the couple's last night, after separating the two lovers, she walks away and nearly disappears in the corridor. Just after, in another shot, you can see her walking away as if she was still in the doorway, although she has already walked past it.
Continuity mistake: In the scene where Magaret is talking to her two bosses, when Andrew knocks at the door, the boss who is on the chair adopts two different positions while listening to her. But he can't within such short time. At first his left hand is pointing at Andrew, showing Andrew not to interfere. Then just after, you can see him on his chair with his legs crossed. Then he returns to his previous position.
Continuity mistake: In the scene where Margaret says "I know Frank can be scary to deal with." we see an over-the-shoulder view of her, with Bob's hand holding his glasses in the foreground. The shot changes to focusing on Bob, and the same hand is now on the desk. It was too quick to move.