I made these speedruns back in August and they are all segmented speedrun. For the first segment I start from the very beginning and then each segment starts with loading the game to the save point I wanted to finish the segment off.
I did not walk through walls with Elum. You can only do that in the PS1 version. There is a new glitch which I do in this run and it was discovered by Sligfantry and it's a death delay glitch which you see when he returns back to RuptureFarms. I am currently recording Abe's Exoddus 100% speedrun which I will be using some glitch shortcuts from Sligfantry's World Record any% run. One of these glitches that he uses is a stop turn delay glitch and he can skip Mines Ender so that he doesn't have to do the puzzle whilst dodging the flying Slig. I do get help from Sligfantry and he has made a video tutorial on how to do the new stop turn glitch:
http://www.youtube.com/watch?v=DIo1TJUBGlo