The dice on Ed's desk change in position and value in different shots. They show a 2 and 1 when Mike walks in, a 4 and a 2 when Ed starts talking, and then goes back to a 2 and 1 at the end of the scene.
Ed makes a bet with the maintenance manager that if his front-of-house team wins the annual Montecito Picnic Games competition over the back-of-house team, the maintenance guys will work a free weekend. Bet or no bet, this would be an illegal violation of the federal Fair Labor Standards Act.