Most of these are just basic "This is how it is done" stuffs. I can explain stuff in more detail if needed.

Dungeon Man Skip

http://www.twitch.tv/falexxx1/c/6515465

Tessie Skip (Credit uusdfg)

http://www.twitch.tv/falexxx1/c/6515361

Exit Tessie Skip

http://www.twitch.tv/falexxx1/c/6515383

Moonside Clip (Can be used to continue invisible man no spawn state outside of Moonside)

http://www.twitch.tv/falexxx1/c/6515284

Belch Base Skip

http://www.twitch.tv/falexxx1/c/4812796