We might worry about digital noise today, but that was nothing compared to the grain that was omnipresent on every 35mm Kodachrome slide. The DSLR I used to copy this picture was more than capable of enhancing every bit of grain on the slide - and don’t dare sharpen the image until you’ve dealt with it. Then there is the dust (and other nasties); if you thought sensor dust was a problem, then you’ll be amazed at what accumulates on a slide that is forty years old. Yes, I used a dust blower and a lens brush but there is stuff on them slides that don’t want to leave home! Fortunately, Lightroom and Photoshop have the tools required to take the image to a place that makes it look better than the original slide - provided you can supply the time.
Long hair, beards and wandering around with a guitar slung over your shoulder; yep, that was the 1970s.