This is the second and final of two appearances Arlene Martel makes in the series, each time playing a different role. Her other appearance occurs in A Seat on the Fence (1960). She is perhaps best remembered for her role as T'Pring, Mr. Spock's betrothed, in Amok Time (1967) from Star Trek (1966).
Given an uncredited bit part as one of the immigrants 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 is the third of eight appearances Grant Richards makes in the series. For most of these appearances, he takes on the persona of different characters. In three of his appearances, this being the first of these, he plays the hoodlum Frankie Resko.