When Steve chooses the challenge, close up he picks up the right-most cup. Yet in the next shot it shows that he picked the second to the right-most cup.
The waffle on Roger's plate disappears between shots while talking to Francine in the kitchen.
When Roger is getting his bag from baggage claim, the airport code of 'IADA' is displayed. There is no such airport code, although 'IAD' is for Dulles.
When Roger is playing the pinball machine, the back of the machine has multiple sockets to plug into. This is completely wrong, as the machine would have one electrical cord that then plugs into a wall socket.
The handles on the Smith's refrigerator are on the wrong side in this episode. Typically when the doors are open we can see inside, but here they are on the left side so we wouldn't be able to see the contents from the kitchen table.