Quincy mentions the blood test he conducted being used by Dr. Noguchi. Thomas Noguchi is the real life Chief Medical Examiner of Los Angeles County who was the inspiration for Quincy's character.
This episode was actually filmed at Malibou Lake in the Santa Monica Mountains.
Guest stars James Chandler, Pernell Roberts, Jack Kelly, and Roger Davis each appeared in Alias Smith and Jones. Roger Davis took over the lead role in that show after the tragic suicide of his friend Pete Duel.
This resort location was frequently used in TV shows in the 1960's, 70's, and 80s. Hilarie Thompson, who plays the woman who hires Quincy, was also in another one on Barnaby Jones (Visitors in Paradise (1977)). Even the Fugitive worked there one time. Coincidentally, someone named Mr. Kimble is paged over the P.A.