Audio problem: When Joe and Old Joe are talking in the cafe, Old Joe asks Joe how is his French coming and Joe replies with "Good. You gonna tell me I ought to be learning Mandarin?" and Old Joe then says "I never regretted learning French." Old Joe's jaw is never shown moving along with the speech. (00:41:40)
Audio problem: When Joe is telling Old Joe that he'll never meet his wife in the future to prevent her death, a shot from behind Joe is shown, where he says "she'll be safe", but his jaw is never shown moving along with the line. (00:48:15)
Answer: The current method works better because an assassin being present confirms the kill and the disposal of the body. If you sent someone back to Hiroshima or some other place you could never be sure the body wouldn't be found.
BaconIsMyBFF