Adapted from the Raymond Chandler-Czenzi Ormonde screenplay used for Alfred Hitchcock's Strangers on a Train (1951), which was itself adapted from Patricia Highsmith's 1950 novel of the same name.
This episode features two guest stars who went on to regular roles on two Warner Bros. detective series: Richard Long, who played Rex Randolph on Bourbon Street Beat (1959) and later "77 Sunset Strip" itself; and Connie Stevens, who played Cricket on Hawaiian Eye (1959).
According to the information seen on Stu Bailey's business card, his phone number OLympia 4-0992.
First use of what became the standard opening credit sequence used through the end of season 4: As the announcer starts his spiel, Efrem Zimbalist Jr. comes out of the firm's office building; then Roger Smith is seen in his Thunderbird; finally, Kookie waves Roger out of the parking lot, then combs his hair.