Lundy (Fred Willard) and Caruso (Vic Greco) are agents 198 and 199. Greco & Willard were a comedy team at the time. According to Willard, they were offered a spin-off series but their agent turned it down without asking them.
The plot motivation for this episode, the Gaul formula (a formula divided into three parts to enhance its security if intercepted by KAOS), is a reference immediately apparent to anyone who took high school Latin. One of the standard texts for such courses was Julius Caesar's "Commentaries on the Gallic War." It begins with the sentence "Gallia est omnis divisa in partes tres," meaning "Gaul is a whole divided into three parts."
Lamont Cranston"s alter-ego was The Shadow.
The Chief tells Agent 99 to take the three parts of the Gall Formula to Lum Fong's Chinese laundry, where it will be disguised as a laundry mark in the collar of a shirt and sent out of the country. In the Season 1 episode 'The Amazing Harry Hoo', KAOS mastermind The Craw used a Chinese laundry to smuggle secret information out of the country disguised as a laundry mark in the collar of a shirt.