I'm correcting a film review by one my ESL students and she has written the following sentence as the first one in one of the paragraphs:
Starring, Joaquin Phoenix, with incredible acting that makes it hard for the audience to difference himself from the actual characters.
It is wrong on several levels, but I'm mainly interested in knowing why the beginning of the sentence and the use of commas sounds so terrible. Do any of you know the reasoning behind the ungrammaticality of this sentence?