Most of the crew seem too old.
Most of the crew look about age 40.
I know they were drafting guys into their 30's during the war and taking some poor specimens, but these guys seem to old to be sending on a PT boat.
Except I guess, for the fact that in real life, the PT boats were death traps, and the navy gave the crews crap WWI torpedoes which couldn't hit anything. So maybe they got all these 40 year olds on PT 73 to free up young and healthy guys for other duty?