A framed picture of two planes in flight, apparently in WWI maneuvers, is seen on the wall at Prebble's airport office, was later one of the decorations in Colonel Klink's office in TV sitcom Hogan's Heroes (1965), the exteriors of which were filmed at Desilu Studios.
This is a rare episode in which Eliot Ness and Frank Nitti appeared face to face in the same scene.
This is the only appearance Anne Whitfield makes in the series. She plays a character named Sue, a diminutive for the character she is perhaps best remembered, i.e. Susan Waverly, the General's granddaughter, in the classic holiday movie White Christmas (1954).
Given an uncredited bit part as one of the gunmen in this show, Charlie Picerni is perhaps better known in the industry for his work as a stunt coordinator/director, as well as performing stunts and acting as stunt doubles for other actors. His work in Die Hard (1988) and the franchise that followed made him a star in the field of movie stunts. The actor who plays Lee Hobson in The Untouchables (1959) is in real life his brother.
This this the second of three appearances Ed Nelson makes in the series, each time playing a different character.