Most of the first four minutes of the episode are spliced from earlier episodes. The mission briefing scene is taken from "Wheels"--down to the error of Dan missing the furnace when he disposes of the recording. The team selection scene, however, is taken from "Old Man Out." This was frequently done in the first season to accommodate Steven Hill, who was reluctant to work on the Sabbath.
A reworked version of the "Family Affair" apartment set is used in this episode. The mostly unaltered set was also used in the previous episode "The Short Tail Spy"
Patrick Horgan, who plays "Wolfe", one of the Nazi conspirators, one year later played "Eneg", Chairman of the National Socialist Party in the Star Trek episode "Patterns of Force"