Minor spoilers about the identity of Zendaya's character!
It's weird to me that she's not Mary Jane Watson—her name is Michelle (we don't know her last name as far as I could tell). But there's the "twist" that she reveals her friends call her M.J. at the end.
I'm not invested in whether Peter dates Gwen, or Mary Jane, or anyone in particular, and if they show up, I don't care if they're white, or if Gwen's a blonde, or if MJ is a red-head.
But it's weird that they decided to apparently do this different thing but also still call her MJ.
Is this some dumb thing like when the comic book Jane Foster was deemed worthy to wield Mjolnir and suddenly she's called Thor and they sorta retconned it so "Thor" was more of a title instead of Thor's name? "Whosoever be worthy to date Peter Parker shall receive the nickname of MJ?"