Let's Hear Some Funny or at Least Inventive Explanations for This:
 

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Easy to reuse if/when they are traded.

Topps used mug shots with the stadiums airbrushed into the background?

Or

Moganas rookie card photo shoot was going on at the same time?

Steve B

Camera person had a left side portrait fetish.

Brian

The photographer always had Raquel Welch sitting in the front row of the stands during his shoots?

"Now turn your head to the right; I want to see if your ears match Shoeless Joe Jackson's!"

Where was the Mack Jones shot? Maybe a cornfield in Iowa?? He does not have a stadium in the background.

"Turn your head and cough"

Alfred Hitchcock was a guest photographer for topps .

Shave and a hair cut two bits.

Fake 🎩 and bad shadowing

I believe the Topps photogs were instructed to get certain characteristic shots; looks like a few of them got used here. Or they were all sitting for silhouettes.

Perhaps Don Mossi's cards should have used the mug shot approach

Beat me to it!

I asked a long-time Topps photographer where they kept all these types of images. He told me in the pro-file.

Ding, ding, ding!

That's a good one!

Probably a standard Topps pose, and one that inspired 1965 Topps Embossed, with all its profiles.

Also, shot was likely taken outside on a bright day and their hat brims would've shadowed faces, so the photog used a bright flash and shot from the side.