During the Batfight in this episode, Vincent Price was to hit Burt Ward with a single egg. After an argument they'd had off the set, however, Price proceeded to pelt Ward with several dozen eggs.
A "Yegg" is slang for a safecracker or burglar.
Bruce reveals that he was Gotham City Junior Marbles Champion at the age of 11.
George Fenneman and Ben Alexander worked together on Dragnet (1951). 3 others had small roles in that series, and more appeared in the 1967 revival.