1. You cannot successfully impregnate a vampire, unless you're Joss Whedon. So don't even try it, babe.
2. Leave the imprinting for the lobsters.
3. To quote the movie: The old vampire doctor says to Edward: "Remember who you are" --which is what? A carnivorous beast with a blood lust.
4. A real story would have expendable main characters.
5. There weren't any good gypsy curses.