The helicopter used for this filming is a 1958 Bell 47G-2 s/n 2204 registration N6720D and is still operational and flying in Schoolcraft, MI in Kalamazoo County.
Even though composer Dominic Frontiere is credited on multiple episodes (as was the practice back then on some series; a composer was credited even though not original score was composed but contained tracked music by that composer), Frontiere only scored three episodes.
Mr. Doneghan's convertible appears to be a Cord 810 or 812 convertible phaeton but is a replica.
The first of three appearances in this series by Ray Kellogg who would appear as a policeman in The crystal wall and in season 2 as a guard in The Prophet.