Endora says that Darrin has the 7 year itch. Actor Robert Strauss (Charlie Leach private Eye) was in the movie The Seven Year Itch (1955).
Ironically , the last words of Charlie Leach in this episode are "They ain't seen the last of Charlie Leach yet". But although the character appeared in three episodes, this indeed WAS the last anyone saw of Charlie Leach. The character was never seen again on Bewitched.
A rare episode where the teaser has nothing to with the rest of the episode. After Sam discovers a snoring dog in her backyard, one would expect the dog would feature in the story. Instead, a cat is the center of attention.