That's why you should always be nice to n00bs. =)
Anyway, I'll explain the glitches/tricks here.
Toad Man: The Rain Flush switch is simply when you use Rain Flush while Toad Man does his as well. It can also be done vice versa with Toad Man using his first.
Dive Man: Nothing special here, just being silly with Dive and Skull. =)
Skull Man: The Skull Breaker (as I call it), works with Toad Man's weapon. It removes the shield and Skull Man acts as if he still had it, and in the video's case, I manipulated getting Skull Man to use it for a long while so I can multi-shoot him so many times. In a Speedrun, I'm not sure how viable this is since switching weapons to and from, as well as using Rain Flush takes up precious frames.
Ring Man: The Pause trick is done simply by holding B when you unpause, which is charging up Pharaoh Shot. It works with all bosses, and enemies that Pharaoh works on, but I did it on Ring Man since that's his weakness.
Drill Man: Nothing special, just showing off that Rain Flush can hit Drill Man while underground. Again, I am almost positive that won't be faster in a Speedrun.
Bright Man: More tricks. Using the Balloon, you can slide on it like normal, but in combination with Bright Man's Stopper, you can stay like that without falling. Other tricks can be done with Rush Jet, Wire, and possibly Rush Coil. Also, the Bright attack at the end is entirely pseudo; I did it on the frames where Bright Man stands still for comedic and entertaining effect.
Dust Man: Originally, I thought you could kill Ring Man with Wire, but he doesn't stay in the air quite long enough. Dust Man however cannot hurt you if you use Wire in the middle of the stage, and then you just play the waiting game. More tricks using Rush Jet, and due to Dust Man using his sucking attack, you can move at faster speeds, fast enough to get the health bonus while dying. I didn't test doing this over the warp to the main room, which could possibly spark some pretty results.
Pharaoh Man: I originally had a plan and a run for him, but he's the most boring boss, and Bright Man's Stopper isn't that great to watch, so I decided to leave him out, and have a surprise ending instead. I couldn't find anything neat about Pharaoh Man or any glitches with him either.
I hope you enjoyed my first TAS. =)