Gene Hackman would go on to bigger roles by winning Two Academy Awards. The French Connection(1971) and Unforgiven(1992).
An Oriental orphan is the pawn in a vicious game of espionage.
The 57 Ford Ranchero (White/Yellow) is in the scene in Denver where the scientist was either pushed or fell from the hotel room.
A very nice 1960 Mercury 2 door is driven by the courier into his driveway as he is killed in a gun battle with Cobly.
F.B.I. Carousel Bulletin: Dean Harens takes over as Special Agent in Charge Bryan (sometimes Bryant) Durant. This part was previously filled by Douglas Henderson in three first-season episodes.