Pointing out most of the references and stuff in "Double Rainboom".
If I missed one, lemme know by putting it in the comments and I'll throw it into the description. I'll just need the time in the actual "Double Rainboom" so I can confirm. Enjoy!
THE POWERPUFF GIRLS™ and © Cartoon Network • A Time Warner company. All Rights Reserved.

MLPFiM Original characters created by Lauren Faust & DHX Media • MLPFiM © Hasbro inc.

Double Rainboom is in no way designed to infringe upon the rights of Hasbro, DHX Media, Cartoon network, or Time Warner. It is, completely and utterly, a fan-based concept and intended for free distribution for the promotion of My Little Pony and The Powerpuff Girls. Hasbro and Cartoon Network are the sole and exclusive owners of all rights in this product, and all uses thereof are enuring to Hasbro's and Cartoon Network's benefit. We agree to never challenge Hasbo's nor Cartoon Network's ownership of all rights to this product.

Congrats to Zachary Rich and his team. You guys worked hard on this, esepcially the little things.

EXTRAS:
Back to the Future tune played when Twilight walked through the flaming rainbows.
TARDIS fell on the clocktower in ponyville at 25:37 of original video.
Smartypants at the bottom right of the scene of Spike's love letter to Rarity. 1:20 of this video.
7:25 of original video = Legend of Zelda item get sound bit.
Portal through the Cartoon Network characters = Cartoon Cartoon Fridays theme remix
Snozzberry is also from Big Friendly Giant, written by Roald Dahl, who wrote Charlie and the Chocolate Factory.
Door Rainbow Dash lands in front of is 221, which is a reference to Sherlock Holmes, who lived on 221B Baker Street in the books.
In the original video at 22:19 when rainbow dash wings are about to cramp up, the skyline has a building that looks like Stark Industries, but it has a A on it, probably for the Avengers.