Ok I decided to test my knowledge of this game. Watched one lap of a random TAS (timeys Bcwii) run that I hadn't watched in years.
I took two random example snapshots in a 3 second period of where I think there are questionable / nonoptimal lines. Anyone agree with me? Or am I wrong.

Ok so this one's a little less obvious than my next example. You might need to watch the run to see what I mean here.
Anyway, I believe this guy should have started inputting left-button input presses earlier upon landing from the ramp to shorten the distance to the next turn. He waits to long to start pressing left, resulting in like a .001 to .008 wider line.

Now this one's much more obvious. I know he's taking it kind of wide to go to the correct geiser, but I am like 99% sure than can be taken tighter and probably save at least .015. That is both an awkward straight line to the geiser and also one that doesn't even cut the corner tightly.
Thoughts? At least I'm trying to be skeptical about my judgement.