I was just about to enter this "slip-up". Yes, he is signaling a count down, but as a cue to the cast, not as a NASA style count-down. The camera pans to the right a little too slowly or perhaps the shot wasn't set up correctly for the scene. It is an obvious slip.
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I'm not sure I agree this is a slip-up. The character knows his brother in law is about to blow and he does a little count-down (or count-up in this case) to be a jerk and show everyone how smart he is. The actor wasn't signaling the cast to leave and was accidentally caught on film, he was playing his part.
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