Unlikely palm trees are visible in the background while the prisoners paint over graffiti.
Klink's office window appears to the left (his right) of his desk in this episode. Later in the series, the window is consistently to Klink's left.
At one point in the epsiode, a road sign is placed to divert the enemy -- the sign displays English words, although the scene takes place in the middle of Germany.
No bulletin board appears behind Klink's desk in this episode.
In an oddity, Carter has to escape a collapsing tunnel and comes up through a foot locker.
Larry Hovis is wearing a wedding ring. In other episodes, his character, Carter is protrayed as single and naive in the ways of women. (Larry Hovis refused to remove his wedding band during filming, and thus, Carter is usually shown wearing gloves.)
Hogan: We still gotta figure out a way to make more ammunition.
Carter: Well, I'm still willing to try, Colonel.
Hogan: Whose side are you on?
Hogan: We're gonna build the bridge with a very special feature.
Newkirk: What do you mean by that?
Hogan: It's going to be the only bridge in the world with a built-in bomb.
Klink: I will throw them in the cooler for life. Even after the war. Even if we lose!
Newkirk: (in German accent) Hello, Adolf? Did you just see a bridge go by at 5000 feet? Ja? (normal voice) Well, it had your name on it, mate!
Klink: If the prisoners ask any questions about these explosions, you know nothing. You are ignorant.
Schultz: Oh, I can handle that.
Klink: I know.
Carter: Well, sure, you remember: We told Klink that Lebeau was part Chinese, we had to have firecrackers to celebrate Chinese New Year.
Hogan: Oh, yeah.
Lebeau: And I cooked that whole pot of chow mein with sauerkraut.
Hogan: Please, not while I'm plotting.
Klink: (as he signs papers) Without requisitions, there would be no war.
This episode marks the first of two unrelated appearances by Hal Lynch.
This episode marks the first of six appearances by Forrest Compton.
This episode appears second on the VHS collection's "Plots Thicken" volume.
In the opening 'montage' credits that run throughout the series, Larry Hovis' character, Carter is shown behind beakers, test tubes, et al mixing chemicals - that shot is from this episode when he is down in the tunnel trying to concoct a bomb using cleaning solutions from the camp kitchen.
Klink: "And if I find any Bing Crosby records, I'll smash them, too."
A sly allusion to the fact the show was produced by BCP -- Bing Crosby Productions.