@friolator - hey, that is an interesting observation. Note that this example film has probably never seen a camera. It comes from an advertizement reel for Super-8 copies of 35 mm movie films like “Star Wars” and “Jaws”, and was most probably created by an optical printer.
I have never bothered to investigate the film gates in Super-8 cameras, but the all the Super-8 projectors which I have looked at use a rather narrow pulldown claw. So only the vertical film position is defined by the claw. The horizontal film position in all projectors I looked at is defined by an appropriately designed gate, usually by some spring mechanism pressing the edges of the film against a fixed stop. I took some guidance from these investigations in the design of my 3D printed Super-8 film gate. As designed, it does not always assure a perfect horizontal scan position. But horizontal movements with that gate happen only at cuts, occasionally, and those movements are barely noticable in the final scans.