Other mistake: When Avon and Cally are taking off their gun belts to hand them to Blake, Avon accidentally clips himself in the chin with the protruding barrel of his gun. (00:22:00)
Other mistake: Just after Cally says that the pilot's death was "a misfortune," she stands and her chair scrapes noisily on the floor. The sound apparently startled Paul Darrow, causing the always-unflappable, nerves-of-steel Avon to flinch: the only time in all four seasons that he's ever seen, albeit briefly, to break character.