"I took a luminous shovel to both headlights" instead of "louisville slugger"
And in Work Bitch:
I thought it said "like its your brother Shawn" not "your profession"
(I knew it didn't make sense but I had no idea what it could be so just always assumed it was this...)
Um...In 'Double Rainbow', I used to think Katy said "'cause I understand you, it's not hard (or it's not an art)", but one day I finally heard the correct lyrics so clearly it shocked me. It's "Cause I understand you, we see eye-to-eye".