Principal Skinner is seen playing craps in the casino at the same time he's officiating at the school assembly where Lisa is dressed as the State of Florida.
Homer comes to get Marge as he's going home from work at the casino, and Maggie is neither seen in the floor nor addressed as to where she is. Homer then leaves without Maggie, yet Maggie is seen at the house the next morning (and Marge is still at the casino).
Abe says one of the dice fell into his shoe, but he is wearing slippers with no place for a die to get stuck.