Responses to Meyer Louie above.
Me: Notice that Cooper is very diligent about removing evidence from this crime.
Mr Louie: This is your original contention, Mr. Rollins. I cited several examples where this statement can't possibly be true.
Response, Sure, he's not perfect, but after 45 years nobody even knows who he is. I guess he did something right!
Me: wears sunglasses for most of the flight,
Mr. Louie: There was a brief time where he did NOT wear his sunglasses. Some people saw him at that time. Diligent about maintaining his identity? I'd think he would have never taken off his sunglasses and would have never allowed anyone to see his eyes and eye color. Again, it begs the question, just how diligent was he?
Response, It might have looked suspicious in 1971 to wear sunglasses on an overcast day with rain showers onto the plane. So he didn't don the sunglasses until after he gave Florence the note. Tina never saw his eyes.
Me: retrieves an empty book of matches that Tina discards and puts it in his pocket! He is going the extra mile to leave no trace.
Be assured he takes the briefcase with him.
Mr Louie: Be assured that I am not assured that this actually happened.
Response, It's okay to have an opposing opinion, since there is no evidence to support either premise.
Me: I maintain that Cooper planned this caper for at least a month. He didn't jump unprepared! He had everything he needed.
Think of the problems he could solve with just a roll of duct tape (kept in the paper bag).
Mr Louie: If he had duct tape, I would think he would have used it to seal up the money bag, rather than going to all that trouble of cutting parachute chord and using it to secure the bag.
Response: And maybe he did! He had items in his paper bag and briefcase that he didn't want anyone to know he had. But while the 727 sat on the ground for almost 2 hours being refueled, he made use of that time and the available material on hand, but without revealing the other items that he had with him.
I guess a lot of this comes down to how you view Dan Cooper. If you consider him to be dumb and careless, then you see all these issues as pertinent to his character. However, if you consider him to be an intelligent and inventive individual like I do, you see these "mistakes" that he commits as just small oversights in the overall successful big picture.