Continuity mistake: When the family first discover the pram on the road after Brad has been killed, its position on the road changes between the first angle and the second angle from the car. Note the wheels and the yellow line. (00:26:25)
Continuity mistake: Near the end, when Oh Dae Su is fighting with Lee Woo Jin's bodyguard Mr. Han, the latter flips Dae Su repeatedly until Dae Su very swiftly jabs Han in the ear with a pair of scissors, the blades of which are pointing upward from his fist. Han flips Dae Su one more time and that's when he feels the injury. He looks down on Dae Su and spots the scissors on his hand, but this time the blades are pointing downward from his fist.