Plot hole: Foster served in the military and even received a Purple Heart as indicated by the plaque in his mother's home. Yet he needs a kid to explain to him how to handle an M72 rocket launcher. A weapon introduced in the 60s and thus well within his time at the military.
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Suggested correction: Not everyone in the military knows how to use this particular type of weapon. In fact, probably most don't.
Plot hole: After the cop is shot, Prendergast heads directly for the pier. There is nothing in the movie that would tell him that Bill Foster would have gone in that direction. (01:31:55 - 01:33:41)
