Audio problem: After Simon rescues Mary as she escapes from her house, when he says, "Where's your father? Where is he?", his mouth continues moving after he stops speaking. (00:07:00)
Audio problem: When Marcus attacks Simon at the loading dock, Simon attempts to take out his weapon, but Marcus takes the firearm from him before Simon can assemble it. He takes the barrel in one hand and the rest of the weapon in his other hand, but one moment later, he's shown only holding the barrel as he removes the silver nails, meaning he must have dropped or thrown away the other part. However, we never hear any sound of the other part hitting the asphalt, even though Simon picks it up from the ground later during the fight. (00:57:40)
Answer: "Heads Explode" by Monster Magnet.
OneHappyHusky