There is one-one of many-Both Mr.Wilson#1(George) and Gladys Kravitz#1 take nerve medicine.I never saw Gladys Kravitz#2 take nerve medicine.Know any other connections?

The second Gladys also took nerve medicine. I just watched the 7th season episode "Samantha's Pet Warlock" and I think she took it after seeing the dog/warlock change forms.

But back to the topic -- both series had actors die during their run who were replaced by another actor/actress. The original Mr. Wilson (Joseph Kearns) on Dennis and the original Gladys Kravitz (Alice Pearce).

The Bewitched House can be seen on the set of DTM. Alice Pearce guest stars on DTM, and can be seen in front of that house with Mary Wickes (Miss Cathcart), in one episode.

Sara Seegar, the second Mrs. Wilson, appeared frequently on Bewitched, usually as the wife of McMann & Tate clients.