Though Film Studies in academia is found related to the Literature studies, both are different academic genre. In a good Film study research, one must find some unique elements of Film- may be as an art form or as a visual form. And in a good literature study research, the basic literary elements must be included.
I agree with Preeti Oza - both literary studies and film studies papers are likely to discuss aspects of narrative representation, but they should also discuss elements of the form related to the mode of representation. For literature this includes: morphology, syntax, metre, and tropes; for film this includes: mise-en-scene, cinematography, editing, and sound.
I think how you differentiate the two will depend on the author of the paper and where they are coming from. For instance, when scholars of literature attempt to study a film, they often look at it as a 'text' or as 'literature' (and there's nothing wrong with that).
However, most academic papers on film studies also focus on characteristics specific to films, some of these are already enlisted by Rafe McGregor such as mise-en-scene, cinematography, sound, and at times (as is my case) dance.