If I recall that episode of Bewitched correctly, there’s a scene in which you can see a police car sporting the witch on a broomstick insignia on its door.
:’) Liz M loved political soapboxing in later roles, it’s easy to forget that she did a lot of that on Bewitched. My favorite of her time-travel episodes (in fact, the only one I remember at all) was the one where she almost wound up one of Henry VIII’s brides.