There are direct similarities to Superbad that can't be ignored. There is a vomiting on another person scene, there's a giant reveal between the two friends that hurts the friendship scene, and there's the fact that Beanie Feldstein is literally Jonah Hill's little sister. I don't believe this movie is ripping off Superbad whatsoever, but there are obvious things that would bring the former movie to mind in regards to this new one, and it would be naive to think they weren't similar.
However, I fully believe that Booksmart takes early 2000s tropes and fixes them with this story. Even taking out the fact that it's about two women and one of them is gay, it just fixes some story issues that I had with Superbad and gives EVERY character far more depth than Superbad could have ever dreamed of. I was extremely interested in every single background character they introduced and each one had their own arc throughout this movie. Then you add in the brilliant commentary of being a 17/18 year old girl on her way into adulthood and LGBTQ issues and it's a really fucking fantastic movie.