The Witness - S4-E23
Revealing mistake: As Schultz comes in the barracks door, there is a sliver of the studio background visible by the door jamb above his head.
Continuity mistake: Klink's name is still on his office door in one scene but suddenly changes to Privat with no one touching it. (00:18:40 - 00:19:15)
Watch the Trains Go By - S4-E19
Visible crew/equipment: As Schultz stops the car, studio equipment is reflected in the windows.
Watch the Trains Go By - S4-E19
Visible crew/equipment: As Linkmeyer and Klink get in the car, a man in a white shirt can be seen moving around the camera position in the reflection on the car under her window.
Who Stole My Copy of Mein Kampf? - S4-E16
Continuity mistake: At the end, Colonel Sitzer pushes Hogan away, calls for music, and puts his left hand over the microphone, with his right hand hanging by his side. A second later, his right hand is mid way up the stand.
Continuity mistake: In Klink's quarters, As Schultz and Klink talk, Klink asks a question and takes a bite of steak, and the fork is still up. After the angle change, the fork is suddenly missing.
Drums Along the Dusseldorf - S3-E30
Other mistake: The fire spread from the back of the canopy to the front too quickly to be real. Therefore, it had to be soaked with an accelerator.
Hogan and the Lady Doctor - S2-E20
Revealing mistake: As the truck pulls into the laboratory yard, the buildings of the city surrounding the studio backlot are seen.
Revealing mistake: As Burkhalter's car comes into the camp, it's easy to see that it's a re-use of stock footage.
Factual error: On the map in Klink's office, the nearest town's name is Hamilburg. This a misspelling, as the real name is Hammelburg.
Is General Hammerschlag Burning? - S3-E11
Continuity mistake: As Hogan and Kinch walk into the club, Hogan is holding the mop up. A second later, it's on the floor, with his hand on top.
Continuity mistake: As Stoffel sets off the smoke bombs, the first one lands by a set of silver cans by a crate. The second one lands in almost the same spot, but the first charge is gone.
Funny Thing Happened on the Way to London - S3-E5
Other mistake: When Lieutenant Bauman starts speaking German, his last two words "especial mission" is said in a decidedly French accent. The correct German phrase would be "Sonderauftrag." Non-German terms like "Mission" were generally avoided in the Wehrmacht for ideological reasons.
Some of Their Planes Are Missing - S3-E2
Continuity mistake: Though six planes were supposed to be destroyed, only two were visible or bombed. At the fade out, the two planes blowing up were a reversed, re-used shot.
Some of Their Planes Are Missing - S3-E2
Continuity mistake: After getting out of the tunnel, Hogan, Carter, and Le Beau are in a truck travelling to the meeting. Hogan in in the right seat, Carter on the left. But as the pull up to the meeting, they have switched sides, Hogan on the left and Carter on the right.
Some of Their Planes Are Missing - S3-E2
Continuity mistake: In the tunnel, Le Beau picks up some darts and tosses one with green feathers at the target. When the camera looks at the target (a picture of Hitler) a blue winged dart hits the board.
Some of Their Planes Are Missing - S3-E2
Other mistake: While Carter starts shining boots, the disturbed stage flooring can be seen in front of the opposite building; the joint between the panels is markedly raised.
Some of Their Planes Are Missing - S3-E2
Continuity mistake: As the boys trade candy bars and Schultz reaches in, Hogan stops everything and his left hand is up with a bar in it, his right hand empty. A second later, his left is down, and the bar has jumped to his right hand.
Continuity mistake: When the Hof Brau is shown, the door is white and opens outwards, and no shrubbery. When Le Beau comes in, the door is completely different, opens inwards, and has a trellis and shrubbery by it.
Praise the Fuhrer and Pass the Ammunition - S2-E19
Continuity mistake: When Hogan and company pull up to the ammo dump, the guard is standing to the left of the "HOCHE SPRENGGEFAHR" (high explosives) sign. A second later he is standing in front of the other end of the sign.
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