Visible crew/equipment: When Don talks to David about his priorities and the importance of finding Rachel Abbott's car, right after David tells him that the car is not turning up, we can see the reflection of the moving boom pole and mic on the glass door.
Visible crew/equipment: After Charlie tells Alan that he and Amita have a lot of work to do and that Alan's hovering over them, when Alan walks away from the table we can see the actor's tape marks on the floor where he had been standing, and also more blocking tape on the rug and kitchen floor.
Visible crew/equipment: After Charlie comes up with the idea of creating a false master key and designing the lock that it opens, when it cuts to them back at the office the yellow T-mark can be seen on the floor by David's foot.
Visible crew/equipment: After the Secret Service agent calls the counterfeiters "our guys," when it cuts to them back at the office at least three actors' T-marks are visible on the floor.
Visible crew/equipment: When Don and David chase down Jose Salazar and get him down on the ground to cuff him, a crewmember (presumably the second cameraman shooting Jose's low angle closeups) is lying on his back behind David.
Answer: Craps is a casino game where players bet on the outcome of a dice roll. It deals heavily with probabilities and is a favorite of math experts like Charlie. Whatever the odds, though, your chances of winning are much greater than winning the lottery.