ABC originally broadcast this episode in black and white.
Alvin Brickrock Presents includes a plot very similar to that of the 1954 Hitchcock film "Rear Window".
When Fred and Barney are knocking on the trunk, Fred's costume is missing its iconic black spots.
The nighttime shot of the couples' houses, over which begins Wilma's complaint to Fred about coming to (his separate) bed to sleep, is the only time that their shared pool ("The Swimming Pool," S1 E3 1960) is depicted in precise detail across their common property line, including the fence &, as Fred had planned it, "a diving board at each end."