When Drake loads a tape machine with an audio tape, it is with a small reel. Later, it shows the same tape being played but with a larger reel, although Drake never changed reels.
When Drake is breaking into an office, he uses a flashlight, but the movement of the light projected on the wall does not match the movement of the flashlight.
(at around 35 mins) Chi Ling asks Drake, "What were you doing at the office of the Singapore Press?" The audio does not match his lips; it appears the actor may have said "Singapore Free Press" on set, matching a sign previously seen outside the press building, and this was overdubbed with incorrect dialogue.