This is where Omni posted his WIP.
http://tasvideos.org/forum/viewtopic.php?t=227&postdays=0&postorder=asc&start=420
The main thing I remember about the room with the guard is I didn't have to pause at all to grab the key. Can't remember if the guard was hit closer to the door though. I wouldn't worry about fixing those errors since you're that far in the game. Even if you do fix them, you only save about 5 frames. About that room before the boss, if I'm not mistaken, you have to delay frames before triggering the cyclops to open up its eyes. Then it'll start moving down sooner so you don't have to go out of the way to grab the arrows. Unless erokky figured out a different way to manipulate this without me knowing about, he was just fortunate to be at the right frame where the cyclops would move down at the desired spot. Overall your WIP really surprised me, with a few extra glitches I never knew about. I beg you to continue this run. You already teased me with this small masterpiece. I know I abandoned OoS. But I can resume it if you'd like. Just please don't abandon this run.