Character mistake: Season 5, "The Masques": Kirby, who has no reason to lie at this point, says he's in B (Baker) Company. But he's a member of King Company.
Character mistake: At the start of the episode when the plane is spotted Sgt Saunders says "P-51." The plane is in fact a P-38 Lightning.
The Short Day of Private Putnam - S2-E28
Character mistake: Hanley's call sign is Checkmate King Two. But his radio man recites, "Checkmate King Two, this is White Rook." Should have been the other way round.