Continuity mistake: When Dan is giving the wait staff its afternoon briefing (the "Push the fish" speech), you see him put the clipboard down and put his leg up on a chair/stool. When the scene cuts back to him, he is standing, then he puts his right foot back up on the stool/chair. (00:18:50)
Continuity mistake: When Dean returns to the drink station after being given a business card, he crumples it and drops it on the floor to reveal that it's for a steakhouse. But it cuts to a front-shot of him speaking to Monty, he still has the crumpled card in his hand.
Continuity mistake: When Naomi is getting out of her chair to flash the waiters, you can see the white of her underwear. However, when she lifts her skirt, she's not wearing any.
Continuity mistake: In the opening party scene you see Monty walk into the room carrying opened beer bottles. As Dean walks in the door, Monty tosses Dean a bottle and as Dean says "Thanks Cochise" he opens the already open bottle.