Electric guitar...

Interestingly for me Say What You Will works on muscle memory.
I actually find that one easier to play if don't think about it.

That era Metallica (and live Judas Priest) taught me pick inflection.
There are people that still don't know that's a thing.

You actually "play" the angle of the pick on the strings by changing it and it sounds different.

Metallica changes their pick angle and drags it more on the stings for the "Jaws" part in the begging of FWTBT and it makes that part sound heavier.

The most extreme example is the circa 1983-86 ish live JP version of Green Manalishi.
They change pick angle on the shuck and it sounds like the drag across the strings is going up in pitch although the note on the string is the same.