Continuity mistake: Chief is tied to his kennel around the collar. But when Copper cuddles up to him for the first time, the rope tied to his collar disappears for a shot. (00:10:35)
Factual error: The ship transporting the Great Britain team to France has a marine radar antenna, which did not appear on ships in that decade.
Factual error: The training set piece is supposedly Japan, but it's obviously taking place in the Philippines. Its biggest giveaway is the presence of Taal Volcano. (00:02:55)