Hawkeye stumbles across the post-op ward, feels the lack of a body in one bed, and says, "Oh, Claude Rains!" Rains played the title role in The Invisible Man (1933).
The character of Tom Straw is played by Tom Sullivan, who is blind in real life.
First appearance of Judy Farrell, Mike Farrell's then-wife, as Nurse Able.
When Frank walks into the Swamp after Hawkeye goes blind, he is whistling 'Three Blind Mice'.