Goof: Newkirk brandishes a knife and this is not seen as a serious security threat, even by Klink.
Carter's ungloved hands are seen in an early scene, revealing Larry Hovis' real-life wedding ring. The actor commonly wore gloves as he refused to remove the band during filming.
Newkirk draws an uncommonly good caraciture of Carter during one of Schultz's barracks inspections.
Art imitates life in this episode: Adolf Hitler actually was a student of ESP and occultist studies. He was also a student of astrology which will be mentioned in later episodes.
A pack of Philip Morris cigarettes is superimposed over much of the closing credits.
This episode shows a very rare glimpse of Sergeant Carter's left hand ungloved while he eats in the barracks. Larry Hovis nearly always wore gloves because his character was unmarried, although he refused to remove his real-life wedding ring during filming.
One of the background prisoners (no name or ever credited) - seen at roll calls, in the barracks and most prominently in Episode 15 shaving - is pressed into service as the guard by Klink's door.
This marks the final appearance of Cynthia Lynn as Fraulein Helga as she would be replaced for the final five seasons.
Update: Actually Cynthia Lynn wasn't really featured in this episode. You caught a quick glimps of her back when Gen Burkhalter walks into Klinks office. This is evident by virtue of the blue shirt she wore most of the time. Her final episode was Season 1 Episode 32.
A rare use of impossible sound effects is displayed in this episode: As Hogan leaves Klink's office and fingers the arrow in the door, an external "boing" sound is used to accentuate the action.
A pack of Parliament cigarettes is superimposed over much of the closing credits.
Schultz first gives the Gestapo man his serial number as 23789, and again later as 23781.
A shortwave radio set appears in Klink's office for this episode and is rarely seen again.
This is the final appearance of Cynthia Lynn as Fraulein Helga, as she would be replaced for the next five seasons.
Early in the episode Werner Klemperer mistakenly calls Hilda "Helga," the name of Klink's secretary only in the first season.
Sigrid Valdis (Patricia Crane)begins her five season run as Hilda, the secretary to Kommandant Klink. The original intention of the producers was to replace the secretary each season, ala The Bob Cummins Show. Since Sigrid did such a great job as Hilda, the producers abandoned the idea and kept her on for the duration fo the show.
When Schultz puts the notice on the bulletin board he uses two push pins one each at the top and bottom, but in close-ups there are four push pins, two at the bottom and one on the right side.
This episode, the first to be produced for the second season, had a different recording of the writer/director music and closing theme than heard in any other episode.
(LeBeau speaks to the guard dogs in French)
Newkirk: What did you say to them?
LeBeau: I promised to introduce them to Lassie after the war.
Lassie Premiered on September 1, 1954 and WW II ended in 1945.
Schultz sees both the bunk and doghouse tunnel entrances in this episode, as well as hearing Hogan order radio contact with the Underground.
This episode reveals that Schultz has five children.