Just saw it

Rating: 7/10 (27 July 2005)

And I don't understand the point of the movie. someone bother to explain?
I mean so he dies from the plane crash in the beginning and the whole movie was just a dream, hence the song at the end. Thats what I'm getting out of it.
Because timeline thing just wouldn't make any sense. Cuz then the sister wouldn't have her show. Jim Cunningham would not be exposed. Frannk would never exist.
Am i making any sense here?
Other than that is there an accepted logic for this movie. Like something that is widely believed.
Thanks!