Yo! As I don't have Twitter, I thought this was the best place to choose =).

I've uploaded five videos with various effects and methods to activate the Invis Barrel Glitch:
https://youtu.be/JIhihp8f1KA
https://youtu.be/Gx7FvgWhKg0
https://youtu.be/0d1I4z0kZPA
https://youtu.be/F_k_Rzp1-c8
https://youtu.be/JTMXO3qyLl8

All of them have a brief explanation and a link to the input recording I did with the Bizhawk emulator, in case you want to view them there to check the values and so, I could through how to do that if interested.

Basic info about the Invis Barrel in general: When the barrel disappears, the game gets confused (Doh) and don't know which sprite value the Kong is holding. The next sprite value that spawns will then become the item you are holding and once that sprite despawns, the next spawned sprite will take its place.

Some sprites can be "manipulated" with your movement, like turning around and jumping, but most of the effects can only be seen if you either throw or put down the barrel, which will usually cause two different effects.

If you hold the entrance to a bonus, the value of which the bonus will take you will also be changed, which allows you to do some nice wrong warping, more info on that can be found in my old TAS for example: http://tasvideos.org/3075S.html

Getting Invis Barrel with split up glitch will have some other effects, thank to having two Kongs at once. This is mostly showed off in the Oil Drum Alley level, where I perform a variation to the invis barrel. There the whole Kong is glitched already, and will automatically modify certain sprites when you approach them. After I take a hit with Donkey, it gets truly weird... A lot of the effects seen are done when I jump, causing Diddy to transform to weird things and even messes up the whole level. This part of the glitch I don't fully understand at the moment, I haven't really looked into it either. I just enjoy the results =).

If you have any questions, or want me to show off other DKC glitches like this, just ask! //Tompa