These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fan Dumb: Many people wrongly assume that Katy Perry is a lesbian because of her song "I Kissed a Girl" in which the lyrics clearly state that the singer has a boyfriend and is not seriously into the girl she kissed.
People also think the song is about lesbians, when it's about being bicurious.
"Not Like The Movies" is already a sad song but after said divorce, it's HEARTBREAKING.
Internet Backdraft: In some parts of the internet it is not wise to bring up "I Kissed A Girl", especially around lesbians who have been burned by girls like the one she's singing about. It's not pretty, to say the least.
Also, imply to a Katy Perry fan that she stole the idea from Jill Sobule, who wrote another song called "I Kissed A Girl" in 1995 and had a hit with it. Not helped at all by the fact that Sobule herself added fuel to the fire.
Lyrical Dissonance: While Lyrical Dissonance is an objective trope, there are a number of interpretations on what the lyrics of E.T. actually mean. Officially, it's a catchy pop/hip-hop song about falling in love with a foreigner. However, the lines "wanna be a victim, ready for abduction" combined with "fill me with your poison", make a pretty good case for the song being about date rape.
Nightmare Fuel: The "California Gurls" video has some, believe it or not. A woman entrapped in Jell-O, and one wrapped up like candy, looking totally lifeless. Okay, Katy lets them out, but it's a song about how girls from California are the best, not Papa-fucking-razzi!
Also she and her friends eat a living gingerbread man. He responds only by smiling. Also that last one may have been inspired by (or copied from, if you prefer) a scene in Tom Petty'sNightmare Fuel-filled video for "Don't Come Around Here No More". Considering that in Petty's video it's a woman dressed as the main character of Alice in Wonderland being eaten after becoming a cake from the neck down, and she looks pretty horrified about it, what happens to the gingerbread man is not so bad by comparison.
Additionally MANY moments from her documentary could make you cry, ranging from the Brazil scene to the bit about the pressure from the recording company's to change herself to the fan appreciation moments to over working herself with excessive travelling and of cause the marriage problems related scenes.
The last few tracks on Prism, especially "Ghost" and "By the Grace of God".
Unfortunate Implications: "Ur So Gay" implies that effeminate, "fake", or other bad people are usually gay and uses "gay" in the "bad/lame" sense. As if "Ur So Gay" didn't imply enough unfortunate things, Katy follows up with "I Kissed a Girl". There's actually nothing in the lyrics to suggest the guy is gay, so it also seems like Katy is enforcing gender stereotypes.
Also in "I Kissed A Girl" is her referring to the eponymous girl as "my experimental game." Ouch. It doesn't help that this ties into the "L.U.G." (Lesbian Until Graduation) stereotype.
Ur So Gay also opens with the line "I hope you hang yourself". With the media attention given to the suicides of queer youth in the following years (which included Katy Perry getting an award from The Trevor Project for helping prevent youth suicide with "Firework")... ouch.
Her 2013 AMA performance featured an Asian theme, something many people found racist.
Could also be applied to "California Gurls" too, but Up to Eleven.
What Do You Mean, It's Not for Kids?: Kidz Bop and the Ubisoft game Just Dance for the Wii, rated E for Everyone, both feature "Hot 'n' Cold", a song that uses the word "bitch". They use a kid-friendly version using the word "chick" instead, noted as "Hot 'n' Cold (Chick Version)".
What Do You Mean, It's Not Symbolic?: At the 2012 Grammys she performed E.T. (a song about her love story with Russell Brand) the power went out mid-song and she then started singing "Part of Me", a song about her break-up with Travie McCoy reworked to fit her divorce with Brand.