There are no major improvement really. What I mentioned above, to cancel the waiting time after throwing objects, is a recurring thing that could probably save up to a second in the run. As this was long known, both used in previous OoA WIPs as well as in the published OoS run, it's a bit on the weak side that it wasn't included here as well. There are also some other minor room strategies that are slower compared to previous runs. And simply by watching this 9 years old WIP in real time, you could have improved some things:
https://www.youtube.com/watch?v=FmXtWUfPixw. So a little low on the general research for the run, must say.
The RNG is very painful in these games. Sometimes you are forced to go with non-optimal RNG for certain rooms, so I can't really complain much in this case.
Overall, not a bad TAS, but quite improveable, as the author agrees on in the submission comments. By actually watching and comparing old WIPs, many seconds could be saved. A good job, but a fairly weak one.