Plan E: General Hospital - S4-E5
Corrected entry: During George's first day in the hospital, he mentions in his letter that Blackadder 'lay down and stuck his foot over the side of the trench'. The trench walls are at least 8 feet tall, so there's no way Blackadder could have done this.
Correction: The exact wording is that he lay on his back and stuck his foot over the edge. That doesn't exclude the possibility that he was lying on top of something.
tw_stuart