Continuity mistake: When Klinger imposes himself between Oksun Li and Crosetti, he puts his hands on his hips. When Crosetti gets up, Klinger gestures with his hands which then drop down on either side. A split-second later they're on his hips again.
Continuity mistake: In Rosie's Bar, the lettering reading "GI CLASSY" is in thick letters. From the outside, the lettering is thin.
Continuity mistake: When Mr's Li first threatens Klinger with a pitchfork in his office, it has four tines. A close up shows a completely different five tine fork. Then back to the first one.
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 ★