Audio problem: When the first assassin runs out of bullets shortly after coming through the apartment window, his gun makes a series of rapid clicks as if dry firing full-auto, but real guns, even full-auto ones, don't keep on clicking when empty. It should either make a single click, or a nearly inaudible one. (00:44:16)
Audio problem: When The Professor is driving in the BMW, you can hear the transmission engage the next gear before he is seen completing the gear change. Shortly thereafter, you hear another gear change, but The Professor's hands are nowhere near the shifter (he's reading his orders on his cellphone).