Continuity: The gag covering Suzanne's mouth changes position (the patterns on the cloth have shifted) when she gets up to kick the bad guys off the dock into the water.

Revealing: The underwater bomb, according to the bad guys' dialogue, is supposed to be triggered by a boat hitting a tripwire strung between two buoys. But it explodes when the boat is still several feet away from the buoys.

Continuity: Illya takes off his shoes before swimming across the river, but somehow has them back on again a few shots later.