When Mannix gets the idea that he might be able to trail Dr. Whitaker (Richard Bull) to where Angelo Palerma is hiding, Peggy gives Dr. Whitaker's home address as 1850 Outpost Drive. That is a real address in Los Angeles, at the foot of the Hollywood Hills just north of Hollywood Boulevard. It also only about a block from the location where the scene involving the hit-and-run was filmed, which can be seen on a street sign in the episode's opening shot - the 2000 block of N. El Cerrito Place.
The same car phone number, KG62114 was used in an Andy Griffith Episode called "The Foster Lady" from Season 6, Episode 27.
While speaking on the phone to the mobile operator, Mannix gives his car telephone number as KG6-2114.