u/TJBRWN

For those who prefer reading instead of watching: 

Reverse Fan Strum: Do a fan strum, but in reverse. 

More technically, its about leaving a gap between your pointer (main strumming accent) and the middle and/or ring finger to create a doubling, drag, or "flam" effect. It offers a different tone and opens up options that are not as accessible with thumb strokes.

2 String Rake: Quickly drag your finger over two strings for a half rake or half strum effect. This creates grace notes that can resonate while playing on other strings. It can be done with any finger for a variety of options.

A "rake" is when you strum slow enough to hear the attack on individual strings, versus a "strum" where the attacks are combined to create a chord.  This technique can be used to produce either sound, but I consider it more of a "rake" because it requires a similar type of finger control to the full rake. That's how I came across it: I was doing a rake and got interrupted halfway!

I haven't cross-referenced these to the technique compendium so I don't know what the proper names are, but this is just what makes sense to me. If you do know the right terms, please let me know. And if you know anything similar and fun, I'm all ears too!