Correct interpratation of the final Scenes, Spoilers!

Just watched the movie.
Read a lot of different interpretation in threads and they all make sense.
Here is my own personal understanding of the last scene.
Kenji gets caught by police and he says "This is Bliss" and smokes a cigarette. He falls in love with Noi
and finds a reason to live. He thinks in future to survive the sentence in thailand and return to Osaka to meet Noi someday. The end scene of japan is imaginary one which he thinks of after his release. Noi's appearance changes a lot when she's shown in japan scene, that shows a long period has gone. He hopes to get released someday to see Noi and feels the bliss of life.



This is just another take on the ending part.

I disagree that you are correct, for there are no correct interpretations to any literary work, simply different ones (those being held by the majority and those being the resistant). An example of an alternate/resistant reading (the melancholic ending) would be:
Kenji dies when he jumps out of the window (there is nothing shown that he could have landed on - simply a BIG fall). And the scene where he is shown in the detention of police is his limbo/purgatory - a moments wait before the bliss that is death (according to the character himself). The items on the table are perhaps the material sums of his life - the items he will use in his judgement. The moments that occur in this suggest that his idea of bliss (i.e. death) would be seeing Noi again. A sign of love perhaps, showing the justification to his otherwise unfulfilled life and that perhaps he was not a "failure".

Reasons why some may favour this interpretation over yours.
In your interpretation, the title of the film has diminished relevance, where in this case Noi is left alone (her name meaning few or one if I recall correctly) and she is indeed herself the lizard whom is alone (supported by the green she wears frequently [the typical colour with which a child draws a lizard]).
Additionally, Kenji is shown smoking whilst being held by the police - a rather sudden change to the choking he exhibited slightly earlier. Perhaps this is his bliss- for not only is it a reminder of Noi, but what is more relaxing that a cigarette?

At the beginning of the film (where Kenji is obviously unhappy - shown through psychological instances such as the symmetrical nature of his life/excessive cleaning - particularly the scene where he spends more time cleaning the sink at the library than washing his own hands) Kenjis life is pretty busy, at every moment he gets to himself he is shown trying to commit suicide. His approach to suicide is interesting - as though he is subconsciously unwilling to die - his noose is pulled down with a simple yank, and you cannot suffocate yourself with a pillow (you will pass out and release grip before you die or even suffer brain damage). Perhaps he was not in a place where he was comfortable with dying, and yet at the end - when he had spent time with noi, and life had slowed down considerably - he was. Theres a lot less irritating noise (such as the ringing of his door at his house) at the latter end of the film - to the point where it becomes simply non-existent - to support this also.
As though following newtons law - you see kenji at the beginning as the last life in the universe, and at the end you see Noi as the last. Has anything really changed? Perhaps I am beyond the looking glass at this point.
If you want, I can throw in the whole reincarnation thing for the two fish in the tank and say that they both died. But then again, what he experienced in the film could be attributed to bliss, so another person could say that he actually did hang himself (although I do not believe this to be the case). The dominant reading is probably that the story is about how life is bliss (whether or not this is because of the infectious disease in peoples brains known as hollywoods romance or not is up for debate).
Food for thought. You can support almost any interpretation, and any interpretation is indeed valid.
Of course, I haven't really read many peoples interpretations of the movies let alone the director etc – making me quite ignorant. However, in this ignorance I can enjoy this film for what it is – an aesthetic slice of 'real life' in which both nothing and the most extraordinary happen. This in itself is bliss.

There is a pool outside his apartment so he does not die jumping from his window. The evidence will support his story so he won't spend much time locked up and then eventually he finds Noi in Japan. Pretty simple really. I don't think there is anything mysterious about the film at all.

I saw this movie several years ago then watched it again for a film discussion group. 2nd time around I saw more of the fun/play in it. Everything from the deliberate ambiguities to the gun pointed in the toilet bowl. "Freeze!"

The ambiguities make for discussion, something most all filmmakers want. Take the open bathroom window. It doesn't show a safe exit only suggests an escape. We supply the rest.

I also noticed something I'd missed the first time around. Came to this board and found someone who actually asked, why didi Kenji flush the toilet? Went back to the DVD for that specific scene in the bathroom. Kenji hesitates before flushing. The scene shifts to the 3 Yakuza in the living room. Several seconds pass before they hear the flush. It made me re-think the ending.

Suppose Kenji knows exactly what he's doing? We've already seen he's quick witted in survival situations. As another poster here points out, facing his brother's killer, Kenji turns out the lights and gets the edge on the guy. So maybe what he's after is getting those Yakuza captured by the Bangkok PD. That explains the dead body of the pimp. Then there's the other 2 rotting corpses. The rule of home invasions applies. You come in my house, gunning for me and mine, I got a right to kill you. It's self-defense.

He'll be questioned; thus the scene in the police station. But right there at the end, puffing on that cigarette, Kenji smiles and I got the sense I'd seen a movie about the metamorphosis of a man's mind. That's where the movie begins when he's suicidal; and it's possible to say that's where it ends too, in the dreamy eyes of a romantic.