I live in Wichita near the Benton airport where the film was made, the hangar is still there where they did some "pre-jump" prep.
My second rig was a PC MkII Comp and yes, I could stand it up - it actually was a lot easier to land than my 135 lol!!!
The CG isn't just for takeoffs and landings. My first corporate flying job was with a Navajo many years ago. I remember it as being pitch sensitive. Ask the pilot to run a weight and balance problem with several jumpers at the door "station" and see what happens. bg