The Zfilm does not show that unless of course it has been altered. And why would he be slumped over if he had not already been shot, which of course requires still another bullet?
I don't think the film was altered. From what I understand the conspiracy arguments against the film are that frames where switched and that the film was developed at the firm that developed film for the CIA.
I do consider the possibility of more shots than accounted. The single bullet theory is laughable, in my opinion. I would like to see an analysis of Connelly, the film, and damage to the degree of Kennedy. All I have seen is a theory about a magic bullet and defense of that theory that doesn't convince me. Connelly getting hit more than once would account for his injuries easily.