Visible crew/equipment: When they're all in the OR talking about Aggie being at the 4077, Charles compares Colonel Potter's art style to Aggie's, and in the next shot as Potter tells the art critic to tread softly, the boom mic is visible at the top, right side of the screen and just as the mic starts to pull up the shot zooms in on Aggie.
Visible crew/equipment: When BJ's in Margaret's tent talking to Aggie about feeling like a prisoner of war, just as he says, "I work because of the war," the boom mic dips into view at the top of the screen.
Character mistake: Aggie says she was there when Silly Putty hit the market in 1949. It hit stores in 1950.
Answer: The C-42 was a military variant of the Douglas DC-2. Very few C-42's were built, so it's questionable that Potter would specifically have seen that particular model, but, given his military background, it's not entirely unreasonable that he might use the military designation even when the aircraft in question is actually a civilian DC-2.
Tailkinker ★