The title alludes to a quote from William Shakespeare's The Merchant of Venice, Act IV: "The quality of mercy is not strain'd, It droppeth as the gentle rain from heaven. Upon the place beneath. It is twice blest: It blesseth him that gives and him that takes."
This one was first-aired the very week President Kennedy was shot in Dallas. It was actually being shown in parts of Britain, and taken off the air immediately after his death was announced there.
Actor Bill Clark who play's Sara's father is only 13 years her senior, He tragically passed away in 1973 at the age of 54 from injuries he sustained in a plane crash.
Actor Bill Clark was also known for playing the stunt double for Dan Blocker.