Early in the episode, it is stated several times that Whitehead and Houdini had both successfully performed the water tank escape. Late in the episode, however, it is stated that only Whitehead had ever done the trick successfully.
Harry Whitehead references being given a milk can by Houdini, which he used for an escape when on tour in London. The milk can, brightly painted and with Houdini's name on it, is visible in the background. It is true that Houdini had a famous trick in which he escaped from a milk can, however it was not painted. Houdini's real milk can, which is now on display at the American Museum of Magic in Marshall, Michigan, had a plain metal finish.
After performing the tank trick, Velma (Ann Blyth) and Harry (Don Ameche) share a drink in his dressing room, where she refers to him as "Don".