LeBeau and the Little Old Lady - S3-E25
Audio problem: After Hogan and company get into the car to go to town to get Lebeau, Klink is walking around to get in the passenger side, Schultz takes off, leaving Klink standing alone. After Klink calls out, you hear the screeching of tires sliding on pavement. Trouble is, the camp doesn't have any pavement.
Sergeant Schultz Meets Mata Hari - S3-E4
Audio problem: You hear Carter ask, "Hey, what are you doing with my mattress?" as the Gestapo searches the barracks, but his mouth doesn't move.
Answer: The core POWs regularly escaped the prison camp but they made it their mission to conduct espionage and commit sabotage in the surrounding German territory. They also collaborated with different underground resistance groups and used a network of secret tunnels to help prisoners from other POW camps to escape, who then relayed vital information back to the Allied forces. Hogan and his men maintained the illusion that Stalag 13 had never had any prisoners escape in order to avoid their covert operations being shut down. Being that the prison camp is set in Germany during WWII, there were no American embassies.
raywest
Hogan has mentioned to different characters that they are actually stationed at Stalag 13 to help allied soldiers and prisoners from other Stalags to escape Germany.