Celeste Holm (Abigail Baldwin) and Tom Selleck co-starred together in "Three Men And A Baby" (1987). She portrayed Jack's (Ted Danson) mother.
In the parking garage, Rick (Larry Manetti) tells Magnum (Tom Selleck) that this is the last time he's going to dress up as a woman for one of his cases. Rick said the same thing after dressing up as a woman in Season 6 "Photo Play" (1986).
The O'Shea Ranch is the same location used as the Lazarus Ranch in Season 5, "Compulsion" (1985). Coincidentally, both episodes feature a storyline revolving around Carol Baldwin (Kathleen Lloyd).