Spoilers ahead...
I enjoyed this film immensely, but I understand some of the negative things people are posting (believability/durability of certain characters after many, many seemingly fatal wounds). Nevertheless, it was a super good time to watch and try and puzzle together.
Question (and spoiler)...wasnt Billy's mom the killer in Scream 2? This seems like a very important backstory plot point missed (unless i missed it). A vital character isn't just the daughter of Billy Loomis ("my dad was a serial killer")...her grandmother was a serial killer too. How did they miss this???