When Schultz counts the prisoners in the barracks, he counts either 9 or 10. In the past, there have been 15 men in the barracks.
In this episode, Kinchloe had to install a new direct phone line patch to Klink's phone from Hogan's office. In previous episodes, it was established that they had a complete switchboard already tied in to Klink's office (see D-Day at Stalag 13 (1967)). They should have just gone down to the tunnel and used the switchboard to make the phone calls to Klink.
When Sgt. Schultz returns to the barracks to count the men for the third time, Sgt. Kinchloe can be plainly seen sitting at the table. He's still sitting there playing with a deck of cards and laughing when Sgt. Schultz opens the door and leaves at approx 11:13. Almost as soon as the door shuts behind him, the camera flips to the right of Sgt. Kinchloe (which is also the right side of the room) and at approx 11:15, Sgt. Kinchloe is seen suddenly coming up out of the secret entrance to the tunnels hidden in the bunk beds. He was supposed to have been checking on the Russian pilot, Igor Grygorovich Piotkin. Two seconds wasn't enough time for him to even finish laughing and close his mouth let alone get up and go down into the tunnels yet there he is coming out of there just like magic.
Update: This is a problem with watching a broadcast version of this episode. In order to make room for as many commercials as possible, the episode has been edited. In the full version, at 11:34/5 (after Schultz has left the barracks), Hogan tells Kinchloe to go get Igor (who is down in the tunnel). At 11:36, Kinchloe exits to the right, heading toward the tunnel entrance. At 11:40, the sound of the tunnel entrance opening is heard while Newkirk says, "He's not gonna settle for anything less than Russia." The tunnel entrance reaching its full open position is heard when Newkirk says the word 'Russia'. At 11:44, Kinchloe (off camera) is heard saying, "Colonel." At 11:45, there is a cut to Kinchloe in the tunnel entrance, coming up the ladder, saying, "He's gone." It is possible that Kinchloe could get down into the tunnel, discover Igor gone, and come up the ladder in 4 seconds, as Kinchloe has often dropped into the tunnel from the barracks without using the ladder.
Update: This is a problem with watching a broadcast version of this episode. In order to make room for as many commercials as possible, the episode has been edited. In the full version, at 11:34/5 (after Schultz has left the barracks), Hogan tells Kinchloe to go get Igor (who is down in the tunnel). At 11:36, Kinchloe exits to the right, heading toward the tunnel entrance. At 11:40, the sound of the tunnel entrance opening is heard while Newkirk says, "He's not gonna settle for anything less than Russia." The tunnel entrance reaching its full open position is heard when Newkirk says the word 'Russia'. At 11:44, Kinchloe (off camera) is heard saying, "Colonel." At 11:45, there is a cut to Kinchloe in the tunnel entrance, coming up the ladder, saying, "He's gone." It is possible that Kinchloe could get down into the tunnel, discover Igor gone, and come up the ladder in 4 seconds, as Kinchloe has often dropped into the tunnel from the barracks without using the ladder.
Maurice Dubois is misspelled Maurice Dubay in this episode's end credits though it was spelled correctly in the previous, Is General Hammerschlag Burning? (1967). This episode's credit creator evidently didn't know French or check for continuity from the previous, where it was spelled correctly, evidently in a rush, as usual for TV.
In one scene, there are reflections from two production lights in Klink's monocle. At one point, one is seen; when he moves his head, the reflection moves and another is seen.