The exterior shot of Klink's ski resort hotel is the Timberline Lodge in Colorado, better known as the exterior setting for the Hotel Overlook in "The Shining."
During his toast, the level of wine in "Horst's" glass changes several times.
Hogan impersonates German Horst Brachman.
A sign is posted in the barracks which reads "Dieses Haus Ist zu Scultzen," or "This is Schultz's house."
Wilhelmina's unseen Underground contacts are named "Wooden Shoe" and "Windmill."
Carter impersonates Luftwaffe General von Siedelburg.
When Hogan brings flowers to a sick Klink, the card with the flowers says, "To the heavens we all shout, get well quick to our favorite Kraut. From the gang at Stalag 13."
A string connected to Klink's cap is clearly visible as he walks toward Manheim, thinking the latter is out of bullets. When Klink is shot at, voila, the cap comes off.
Hogan fashions a giant swastika to mask a supplemental antenna atop Klink's flagpole.
Larry Hovis' real-life wedding ring is briefly visible in this episode, during his scene alone with Fraulein Richter. Hovis generally wore gloves while portraying Sgt. Carter because he refused to remove the band during filming.
Just after the opening credits, the shot of the front gate of came was of a winter scene instead of the usual one.
A pack of Parliament cigarettes is displayed over the closing credits.
The title of this episode is a play on the movie title "Night of the Generals" (1967) starring Peter O' Toole and Omar Sharif. The movie involved a plot to kill Adolf Hitler in 1944.
The POWs walk by two buildings in the compound, one labeled "Barracke" in German and the other "Recreation Hall" in English.
Klink's open office door reveals a male assistant sitting in the outer office.
Larry Hovis' hands are uncommonly ungloved during the vest testing scene. His left bears a real-life wedding ring which he refused to remove during filming. (This is why Carter nearly always wore black gloves.)
Hogan uses a broken coat hanger and a pair of LeBeau's gloves to create a makeshift set of noise-cancelling headphones for Schultz.
Captain Roberts' double is noticeably taller than Roberts himself.
Goof: Major Hochstetter says that Hammelburg (near Stalag 13) has been chosen because of its proximity to Düsseldorf, but his geography is way off -- Hammelburg is 250KM from Düsseldorf.
Schultz is unusually womanizing here, while he's generally quite supportive of his family, arguing that he has a wife & 5 kids to support, and that they eat a lot!