How are horror conventions challenged in scream?

One of the main conventions of a horror film that is challenged in scream is the fact that the main character in the film; "Drew Barrimore" dies in the opening scene. This challenges the conventions of horror as many expect the main character to remain in the film throughout until the end with the "final face off" with the villain. This adds a sense of mystery to the audience and keeps them on edge as they have never experienced something like this in a horror film before. We know that Drew Barrimore is the main character as the character is portrayed in posters and advertisements with the title of the film.

The opening scene of "scream" shows many other conventions of horror such as the reference to the film "halloween" with the knife when shes talking about her favourite horror films as it shows a glimse of what is to come in the film and how she tries to protect herself.