Communication Breakdown - S10-E6
Continuity mistake: When Charles leaves the shower with newspaper covering his privates, the newspaper at his backside is wrinkled and messed up when he enters the Swamp in the exterior shot, but next shot the papers are different and arranged neatly.
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 ★