Yes, the story is told in two to five minute segments. This is because the movie is told strictly from the viewpoint of the main character- who is restricted to short term memory. Our short term memories hold only about five minutes of information, including the present. Yes, the story is linear, but the main character is not.

The movie begins with the end, and alternately walks backward from there and forward from a point about a day prior. The the distant past portions are shown in black and white and the more recent moments in color.

The protagonist isn't talking to himself, he is talking to someone on the phone. As for the so called homo-erotic scenes, please. Each of these homo-erotic scenes adds to the understanding that this is a man who lives almost entirely by ritual. He can only trust himself, and he has to rely on notes. He trusts his handwriting, but loses context. He does what the notes tell him to do not because he understands why he told himself to do it, but because he knows he told himself to do it. It is character development through action...which is handy considering these scenes occur during story development by expository dialogue

It is a movie that bears watching at least twice, not because it is confusing, but because on the second viewing, your own perspective is altered and you will see much greater depth... and more questions.