Audio problem: They went to an investigator to let him listen to the audio. The audio with the woman screaming and the gasp, the gasp was Zak, not another apparition.
Audio problem: When Hardison is talking to Carrey, just after he names his price ("30%"), there is a shot from a strange angle in which we hear Hardison talk while his mouth doesn't move at all.
Audio problem: When Olivia calls Astrid to tell her it wasn't Walter's research, we cut to Astrid who says, "Good news", but her lips do not move. (00:33:57)