When Daphne is playing pool for money, there are two piles of bills on the table, but when she picks the money up, there is only one pile.
After the pool game is abandoned when Frasier accidentally jostles one of the players, the color and position of the balls on the table varies erratically between camera shots.
Two large thugs are stopped by glass doors with only a pool cue through the handles to keep them closed. There's so much play in the handles they wouldn't have even had to break the pool cue to get out. Instead they just turn away.