Analysing the film..SPoilers ..
this is my take and my own analysis of this film, obviously it contains heavy spoilers to those who have not seen it, so if you have not seen it, stop reading now ..
A) the first question that comes to mind, is did Warwick imagine these people or were they ghosts or real ? obviously, the answer is easy and that he was imagining them.
but the more important question is, did he imagine them out of his own sick game or was he hallucinating ?
i will list three different explanations :
1) that he is completely crazy, and he is actually seeing and hearing those people, that is he is hallucinating.
and i find this hard to believe, because this means he is completely crazy and lost his touch with reality, but if that is the case, then he would have been noticed by his colleages at work and they would have known that he was crazy and so he would not have continued in his job as a ploiceman.
So, 2) he was imagine playing, just like kids, he was not actually seeing and hearing them, but rather fantasizing that he is surrounded by people, that he has friends and that they talk and interact with him, that is, he fabricated a big fantasy world and actually pretended to believe it. but deep inside he knew it was not real. something that is called Fixed Fantasy.
maybe similar to Factitious disorders, where poeple fake their illness for attention so much that they sort of start to believe it is real.
3) Drugs and intoxication, probably very close to number 2 above, where he fantasize about having friends and people around him and he enhances the experience by using drugs, like hallucinogens which helps him to actually experience, see and hear these people. and unlike in number 1, people who are using drugs don't lose their touch with reality most of the time and know that what they are seeing are not real.
a side not here, the whole thing about Red and White wines, probably he mix the Red wine with sedatives, while he mix the White wines with stimulants and hallucinogens, and so he drinks the White to enhance his fantasy world, and that is why i noticed him starting seeing more and more people in his house as he drank more, maybe stronger effects of the increasing amount of drugs in his system ?
there could have been a 4th explanation, that is he has a multiple personality disorder, but usually, the other personalities take over completely and do not coexist at the same time, so i dismessed that possiblity.
so i guess most likely, it is option number 3 that is closer to what really is happening.
B ) another question, did he actually kill those people, or shall we say, that person in his photo album ?
my take is that Warwick is a psychopath who likes living in a fantasy world, he likes inflicting harm in others, and probably fantasizes about killing others, just like any other psychopath, they usually escelate in their psychopathology, and they shift from fantasizing about killing someone to actually doing it.
1) I really can not tell if he actually killed the guy in the photo album or not, probably not and he was just another victim whom Warwick kidnapped and fantasized about killing him but never did. maybe he was another person wanted by the police or a homeless, we don't know. but at this stage, Warwick still did not escelate into the real killing.
so when John Taylor dropped by, it was Warwick's chance to live another killing fantasy with him, never having the itention of killing him from the start.
that is why, the scene where Warwick was having a fantasy of having sex while John was tied up in the tub, probably, that when Warwick was so close to get to the part where he acts the murder, he started to get sexually aroused, because that fantasy has a sexual arousal effect on him.
2) that Warwick has actually reached the killing stage, and that he actually killed the first guy in the album, and that he was planning to kill John too, but when he knew he was the guy who stole the money, he changed his plan, and decided to play around with him, and enjoy just the fantasy of killing him without really doing it, so he can get a chance to steal the money from him after he lets him go.
C ) is Warwick going to kill the ploiceman at the end ?
probaly yes.
wether it was option 1 or 2 above about the killings, he is most likely has a plan to kill the ploiceman.
if anyone noticed, just before the ploiceman walked into Warwick's office to confront him, Warwick was looking at all the murder and killing photos with joy, because these images arouse him.
so if he was still not at the killing stage of his psychopathology, he is very close to flip and make his fantasies real, and so now that the policeman knows about him, he might have found the motivation to help him excute his fantasies and turn them into realities.
i guess that is about it. any thoughts ? questions ?