Question: How does Cassandra manage to find Brett's home address and track him down there? There's no suggestion he gives her any other information than his mobile number, which isn't enough to find an address.
Question: Did I miss something somewhere? What was so special about the baby that its birth would change everything?
Question: When Josh is in the further looking for Dalton, what is the deal with the family that looks like mannequins and has the creepy smiles? Why does the one girl shoot the family? Is there any back story on it?
Answer: It's implied that the girl went crazy and killed her family, but it's not really elaborated on. They're just some of the many spirits to be trapped in and haunt the Further, likely due to the violent nature of their deaths.
Answer: They are just people trapped in the further after their terrible death. It would be nice to later find out the back story on them in a future film.
Question: I didn't understand the movie. Was it all a metaphor for her descent into madness? And the ending. How much of the movie was imagined and how much was actually real?
Answer: **Spoiler Alert** I would say you are correct about the movie being a metaphor for descent into madness, but also displays themes of repressed sexuality and transformation. As the main character is given the lead role, she must play dual roles, one good and one evil, with the hallucinations representing the latter. Towards the beginning, Nina only embodies the personality traits of the white swan, innocence and grace. As the film gradually progresses, Ninas hallucinations represent her metamorphosis into the seductive and mysterious black swan. The film expertly convinces the audience that Lily (Mila Kunis) is out for Nina's role. In a twist ending, it is revealed that Nina has imagined most of her encounters with lily (including their sexual one) and has instead been battling herself, such as breaking away from her domineering mother and coming to terms with her sexuality. At the end, Nina really does stab herself (but actually hallucinates it is Lily she is stabbing) and her fate is left ambiguous.
Question: I know that Bruce Willis and Kevin Smith didn't get along at all when working on this movie. What was the reason behind their feud?
Answer: In his recent book 'Kevin Smith's Secret Stash', Smith states that he experienced "true darkness" working with Bruce Willis. According to Smith, Bruce Willis does not enjoy making movies. Smith accuses Willis of being lazy and accounts several stories of the two having creative differences on set, including Willis being angry that Smith allowed Tracy Morgan to improvise dialogue. Willis also apparently took issue with Smith contradicting him in front of the crew. For his part, Willis has only vaguely commented on the animosity between the two, calling Smith a "whiner" in one interview.
Answer: It was all Black Market merchandise. Usually not of any good use; total rip-off.