Peggy Pope, the actress who played the cat burglar's widow, Frances Newbound, appeared in 5 other episodes. "Strike" in Season 3 as Lonna Lane. The Prisoner in Season 5, The Judge in Season 6, Lady and the Bomb in Season 7, and Obituary in Season 8.
The story that Inspector Luger is telling as he enters at the beginning is the same one he tells during Kidnapping: Part 1 (1978).