This is third and final appearance by Gillian Dobb (Mabel) in the series as a character other than Agatha Chumley.
The trick of impersonating an exterminator is something the Simons did in the past on their own show Double Entry (1982). They used the same slogan seen here (If it flies it dies, if it crawls it falls), but the company name is different.
Reunites Selleck and Fairchild after working together a few years before on Concrete Cowboys.
At the beginning the background incidental music has parts that is very recognizable from LA LAW especially before, during and after the saxophone parts. This is not too surprising as Mike Post wrote music for both Magnum and also LA LAW.