First appearance of MacGyver's '46 Chevy truck. Up until this point, he's always driven the black jeep.
Originally, the character of Jesse Colton, played by Richard Lawson from another episode Ma Dalton (1989) was supposed to appear in this one, but Lawson was unavailable so the brother of his character, Frank, was created.
The number to the Phoenix Foundation is 555-3493.
The address given on Frog's collar tag is 312 Elm, Los Angeles. There is a 312 Elm Dr. located in Beverly Hills (and it is an Apt building). There is also an Elm Street in LA, but all the building numbers are in the 2000+ range.
The gate entrance to the Phoenix Foundation "Research and Development Western Division" is in fact the gate to Bridge Studios - Boundary in Vancouver, BC.