Audio problem: During the Walmart scene, it seems they edited in Gary saying "Oh, God." However, it's over no visible mouth or throat movements. (01:15:17)
Audio problem: When the invisible man slaps Sydney (making Cecilia look guilty), the sound of a bare hand slap is heard. But the invisible man was wearing gloves as part of his suit, so the sound would have been duller and blunt.
Audio problem: During the final test, at one point Marcus says "Shoot this piece of s**t Ezekiel, now." In the first shot, it's clear he's saying something entirely different as his mouth movements don't match the dialogue. The scene then cuts to a closeup mid-line, and the closeup does match... but the first shot doesn't match in the slightest.
Audio problem: After being told to leave the restaurant, Jung-seok says to Chul-min "You go ahead" and Chul-min proceeds to leave. As Chul-min begins walking away, he is heard sighing in a very heavy and exhausted manner, but his mouth isn't shown moving when it happens. (00:16:22)