Chapel stays in rooms at the Paladin Motel chain. The owner is "Boone Paladin", a reference to Richard Boone, who played Paladin in Have Gun - Will Travel (1957).
Mr. Chapel's phone number is 555-0132. It is the same in every episode except Eden (1998), where it is 555-0182.
The show was originally titled "Mr. Chapel".
It was originally going to be another TV adaptation of Batman that featured Batman and Catwoman, but amidst the cancellation of Lois & Clark: The New Adventures of Superman (1993), it was retooled into the show that featured Chapel and Griffin.