So, the advice I got before regarding sanding was great, and made a big difference. I thought I could push it a little further.

I put down the first coat of oil-based clear finish (satin) on my bare red oak floors. There was a couple spots I guess I didn’t press hard enough and the finish didn’t seem to penetrate the wood to the same degree as the rest of the floor. The spots almost look like bare wood, but I can definitely feel there is poly there so I didn’t “completely” miss them.
I doubt the second coat will “cover” these up at all, so I guess I should fix them first.

Is my only option sanding the entire board affected and recoating just that board? I feel that is a bigger risk as then it may dry different than the rest, and it is hard to use the same application technique for a single board.