Wich2, yep - seems like the camera was tilted 90 degrees, and Alyn pretended to be flying horizontally (you can see he's trying to hide the S with a hand, so Katzman could just flip the image when Superman flew the opposite direction).

Don't know if anyone/everyone has seen these, but a talented animator has used the serial theme for some original animated shorts:



(I have never been able to figure out how to post the actual video here).

But these are great!  THIS is the style of a film I'd like to see.

Deep water is dark and restful and full of peace.