the opening scene of Happy Days, hot rods and a drive up rollerskate burger joint that was called Arthurs and Arnolds

 this scene was used in different episodes as a commercial bumper, and you can see that they had a longer take flimed, but cut it for seperate bumpers

as you can see from the above and below comparisons, they had multiple sets that were similar, but the "eat" sign on the far right side changed locations, the cars changed license plates from California to Wisconsin (they pretended to be living in Milwaukee )