Larry Manetti was also in the revived versions of Hawaii Five-0 (2010) as well as Magnum P.I. (2018) with the late Roger E. Mosley.
Although they do not share any scenes together in this episode, the last time Tom Selleck and Larry Manetti, of Magnum, P.I. (1980) fame, were reunited together was 16 years ago on the series When Life Gives You Lemon Bars (2007) with the late Roger E. Mosley
Near the beginning, where the man in the wheelchair is holding a revolver on the shop owner, the revolver is known as a Fitz Special in that the front of the trigger guard has been removed. Often done for quicker and/or easier access to the trigger due to wearing gloves or having problems with your fingers.