The Return of Major Bonacelli - S4-E25
Continuity mistake: Klink poses for a picture in quarter profile of the right side of his face for Bonacelli, who is actually getting a shot of the guns. Later, you see the picture, and Klink is fully facing the camera.
The Return of Major Bonacelli - S4-E25
Continuity mistake: When Klink is insisting on talking to the cook, Bonacelli has his hands clasped in front of his plate. When the angle changes, his hands are down on wither side of his plate.
Answer: Nimrod's actual identity was never revealed in the series. It was only known that he was a British intelligence agent. Nimrod was not Colonel Klink. Hogan had only implied it was him as a ruse to get Klink returned as camp commandant, not wanting him replaced by someone more competent who would impede the Heroes war activities. The term "nimrod" is also slang for a nerdy, doofus type of person, though it's unclear why that was his code name.
raywest ★
"Nimrod" is originally a king and hero mentioned in the Tanach and taken into the Bible and the Koran. His name is often used in the sense of "stalker," "hunter," and sometimes figuratively as "womanizer" as in "hunter of women." I've never seen it used to denote a nerdy person, and although I cannot disprove that connotation, I think given his role, the traditional meaning is more likely the intended one.
Doc ★
It's widespread enough that Wikipedia has an entire section on it: https://en.wikipedia.org/wiki/Nimrod#In_popular_culture