Matt insists that this song has nothing to do with the Columbine tragedy. It is actually about a friend of his in a mental institution.
The American version of the album came with a parental advisory sticker, but not the Canadian one. An edited copy was also released in the US, with the rear text titles "Born to Kill" and "A Boy and His Machine Gun" changed to "Born to K---" and "A Boy and His M-----e G--," possibly because of the Columbine shootings.
The twinkling music at the end is actually a music box playing "Happy Birthday." Matt threw it around until it nearly broke to get the distorted effect.
It was never a big hit, but "She's A Rainbow" became one of the most popular Rolling Stones songs in the digital age when it started showing up in commercials (iMac, Photoshop), and TV shows (American Horror Story: Coven, Ted Lasso).