This was the only time Kathleen Freeman did not play Gen. Burkhalter's sister. Alice Ghostley plays her instead. Somewhat curiously, the character's name on the end credits is spelled "Linkmaier," with an I instead of with a Y, as it is spelled in the episodes with Freeman playing her.
General Burkhalter's first name is apparently "Albert", as that is how his sister addresses him.
The train explosion scene is the stock scene of a model train being blown up that has been seen several times previously. This time, the negative is reversed, and the train is going from right to left.