Double Rainbow is dragged down so far by it's chorus and bridge. The verses are 10/10 flawless, but the chorus is only 7/10, with the middle 8 floating around 6 or 7 depending on my mood.
Still think a, fairly literal, video of Katy abandoning her life to go treasure hunting with her partner for decades before they finally find the pot at the end of the rainbow would've been flawless.
Really wish that "Classic Movies" theme that was hinted at with the Roar/Tarzan poster was actually used. Double Rainbow/Indiana Jones would've slayed.