Susan Gailey is the mother of the 13 year old who was assaulted by Roman Polanski, Samantha Geimer. He has been on the run ever since and wanted by US feds.
The license plate on Starsky's red & white Torino is here shown as 537 ONN.
In this episode Starsky has the usual microphone for a police radio. In other episodes he sometimes has a phone handset.
Features the "long-lost friend of the protagonist/hero", an alleged "very close" or "dear" friend of one of the main characters (both of them here), but who has never before been seen nor even mentioned---and is never to be seen or heard of ever again for the remainder of the series. '70s shows were fond of creating storylines around this trope. Curiously enough, another one had already happened the previous title, and that was Hutch's childhood friend. (In a later title, Starsky's brother will be featured; not a friend but, again, another childhood character, never to be seen again.)