All through the movie Ed Harris is wearing a POW-MIA bracelet. The Vietnam conflict was still going on during the end of 69 and into the early 70's. The POW-MIA bracelets didn't come about till the late 70's to early 80's as far as I know. Please correct me if I'm wrong
Did you consider that possibly they just didn't become popular until the 80's? They could have easily been around, but just weren't really advertised and no one had picked up on them yet.
I realize this is REALLY late but the poster was wrong. The POW/MIA bracelets were around very early in the 1970s. Here is the history of the POW/MIA bracelet:
http://thewall-usa.com/bracelet.asp