This episode of "Harry O" ('Gertrude') won The 1975 Edgar Allan Poe Mystery Writers Award ("the Edgar") for "best episode in a television series." The award for writing went to Howard Rodman, who was also the series creator.
Harry's neighbor Mildred is referred to but not seen. Mildred, played by Barbara Leigh, appeared in one of the two "Harry O" pilot movies, "Smile Jenny, You're Dead (1974)."
In September 1974, Julie Sommars--in addition to appearing in this very first episode of "Harry O"-- also appeared in the very first episode of "The Rockford Files."
Julie Sommars had guest starred with David Janssen twice before--in "Stranger in the Mirror (1965)" and in "The Blessings of Liberty (1966)."