Visible crew/equipment: The crew is reflected on the motorcycle-cop helmet when Mark says "He is not drunk".
Continuity mistake: When Ricky Gervais drives home to the big crowd outside his house, he unbuckles his seat belt and it slides up and along the inside of the car door. In the next shot when he opens the car door, we can see that he's coming out of a different car, with no seat belt visible inside the door. (00:51:25)
Continuity mistake: When Anna and Mark go out on their date, in Anna's drink the straw is first sticking out pointing to the right, but in the next shot or two, it points to the left, and then back to the right one shot later.