About 3/4 of the way through the episode, Jonathan/Robert Wagner imitates Cary Grant while talking on the telephone. Cary Grant was the original choice to portray Jonathan Hart, but he was 75 years old at the time and had retired from acting several years earlier.
The magazine that Jonathan is reading when he's in the bathtub with Jennifer is the July 1979 French issue of Marie Claire featuring future star Andie MacDowell on the cover.