This episode is portrayed in real time, with the elapsed time marked by an on-screen clock shown throughout most of the story.
There is no laugh track in this episode.
For the HD remastering uploaded to Hulu, the analog clock effect on the bottom of the screen was recreated and repositioned to better compliment modern day 16x9 Widescreen televisions. The new placement of the clock is evident when compared to stills from the original 4x3 broadcast.
Once again, a critically wounded patient has type AB blood, which is relatively rare. Surprisingly, for its rarity, the AB patient is known as the universal recipient who can receive A,B,O,or AB blood, the only critical point being the Rh factor. This cross-compatibility wasn't fully understood during the Korean War, thus the need for AB blood being stressed.
Major Winchester's blood type is revealed to be AB-.