The article was, from beginning to end, unadulterated tosh. Regarding the well-known Bonanza/Debonair/Baron trick of the door popping open as you get airborne, I've never heard of any change in the flying characteristics - the wing-drop has to be a figment of the author's imagination. I've asked around to confirm this; all you get is a lot of noise (and all the loose paperwork being sucked out!).
Yup! Jaba has video of a door "pop" in an A36. He might post the link if he sees this.
I have "popped" the door on the V35, A36 and 55 Baron - it just gets very noisey!
Dr 