Fred Flintstone's new boss A.A. Carborundum has an assistant named Pebbles. This show was broadcast in 1961. Fred's daughter, Pebbles was introduced in 1963.
This is the first appearance of Mr. Slate but he is still called Mr. Granite at this point.
ABC originally broadcast this episode in black and white.
Barney's reading of the bus driver's manual is a parody of the lyrics to the song "Ballin' the Jack."