Trivia: As Major Zolle digs, Kinchloe tells the other prisoner "You may fire when ready, Gridley!", which the man turns on the water. The line was originally an order given to Captain Charles Gridley by Commodore George Dewey during the Battle of Manila Bay, May 1, 1898, and has been used numerous times over the years.
Request Permission to Escape - S1-E32
Trivia: When Carter first goes into the bar, the Artillery Private he speaks to is played by William Christopher, who, besides a couple of other spots in the series, is better known as Father Mulcahy at the 4077th Mobile Army Surgical Hospital, or M*A*S*H.
The Great Impersonation - S1-E21
Trivia: Toward the end of the episode, look carefully at the Commandant's office exterior of Stalag Four. It has a white railing, a few other support pieces, and a sign "Stalag 4" under the office sign. It is the same exterior for Klink's office, just re-dressed.
Answer: It's a solitary cell. Steve McQueen, star of 'The Great Escape' is known as the 'Cooler King'.