I was interested of the decision Donamer made in 4-2 to pick the star as late as possible. I wanted to see if it can be made faster by picking more cherries in the whale part of that stage.
I did indeed manage to make it 1 frame faster than Donamer's movie. It could be made at least 2 frames faster, because I lost 1 frame before taking the rocket, and I'm not sure whether I played optimally in the spike pit. (And not sure whether I picked Birdo's egg as early as possible, too.)
https://files.tasvideos.org/bisqwit/donasmb2-4-2.zip
(seek to frame 39560)
I still didn't verify the sand pit scenes, but they look to me, like they could be made faster, by better planning the timing of the horizontal acceleration, to avoid spending unnecessary time on top of the enemies, that are used to skip rows of sand.
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Yay for Asgard-style usage of commas in English.