When Sandy - pretending to be Mrs Slocum - hires Mannix to find Mark Slocum, she mentions "those people, the ones in Chile, who lived for 67 days after their plane crashed." She's referring to the flight disaster involving a Uruguayan aircraft that was carrying a Uruguayan rugby team and crashed in the Andes mountains in October 1972. Sixteen of the passengers survived the freezing conditions and lack of food for over 2 months before they were rescued, just under one year before this episode aired.
The doll that Ellie is holding when she leaves is a Raggedy Ann doll.
Desilu alumni here. Kenneth Tobey (Ted Bailey) from Whirlybirds and
Mark Lenard (Hal Morgan) from Star Trek plus of course Desi Arnaz and Lucille Ball as executive producers. Don't forget Bruce Gellar Developed by and executive producer, developed Mission Impossible; all Desilu.