Around 22 minutes into the episode, Mike and Carol pull up in the station wagon and park in the driveway, having gone grocery shopping. But by the time they walk to the patio and question Peter and Bobby (who then dart off) and Carol turns to Mike and asks, "Cavit his eruptor?", the car is now glaringly absent in the background.
When Greg is being shown the Bel Air, studio lights can be seen reflecting in the windshield. It is clearly not sunlight.