Jimmy tells Johnny "go to the married chick's house, if you don't hear from me by 10 kill her". We later see Johnny look at his watch outside her house - the time is 9:05pm. Later Jimmy arranges the meet for 1 hour's time - which would mean that it is sometime after 10:05pm. However after the meet, Jimmy looks again at his watch, which says 10pm. It should have shown a time after 10:05pm.
When Johnny says "Answer, or you are a dead man," his lips do not move.