WP:
"And it shouldn't be considered suspicious that the same cameraman doesn't know the film speed he used, right?"
Actually, "film speed" is the ASA of the film stock, which should have been ASA 25 for Kodachrome II stock in daylight.
I think you mean "camera speed" or "filming" speed", the frames per second of the camera's film transport.
With a variable speed motor, commonly called a "wild motor", a cameraman might commonly set one speed and just leave it at that, not tending to change it except for a specific photographic need. The Kodak K-100 has a "wild motor" and people operating it may settle for one speed and never touch it again, or adjust the speed for photographic purposes.
I've never heard any discussion of Roger's photographic knowledge or sophistication, so I can't guess if he adjusted the camera filming speed for specific purposes or not, during the time he had the camera and was doing all his reported filming. Some cameramen do cretively adjust the camera film speed, others don't.
As for what a cameraman checks, I'd say that first is footage (can't film if you run out), second is exposure (the len's F-Stop) so the film isn't washed out or too dark, third is focus (since he's looking through a rangefinder, not true "through the lens" viewing, so if it were way out of focus, he couldn't see that in his viewfinder), and then maybe double check his filming camera speed setting (a difference betewwn a 16fps rate and a 24 fps rate changes the exposure duration by about 1/3 of a stop, which is well below the film's exposure latitude of about 2 full stops, so a wrong camera speed setting would be the least of his errors as far as a mistake on camera settings go, the least likely to fail to give him some usable footage. So checking that setting isn't his highest priority.
So of four settings that are important to filming, he was vague about the least critical of the four. Not a perfect cameraman, but imperfect isn't necessarily suspicious.
Diogenes:
"But if he knew how much film was left in the camera, then it is suspicious that he didn't stop the camera when he was moving for position, or that he would film trees for several seconds while waiting for the subject to emerge from behind them .
No bubbles bursted here.. Anyone else ? "
You have obviously never filmed a spontanious event you had no control over, and had to make a judgment call of when to shut down the camera and when to keep it rolling, balancing in your head the fear of running out of footage against the fear of missing something sudden and unexpected.
Bill