Reference is made to Nelson Eddy in this episode. He was an American singer and actor who appeared in musical films during the 1930s and 1940s, as well as in opera and on the concert stage, radio, television, and in nightclubs. He was one of the first "crossover" stars, a superstar appealing both to shrieking bobby-soxers and opera purists, and in his heyday, he was the highest paid singer in the world.
This is the last of 4 guest appearances of John Myhers in the series. He played a high-ranking German official in all appearances.
The license number of Burkhalter's vehicle is: H NJ2825.