The first thing that I noticed about this chapter is that it is all over the place, or all over the "time" if you will. It kept jumping back and forth between the war, and Billy being on the Tralfamadorian ship. It sort of created a feeling that time is unimportant, like everything that did happen, or will happen, is already happening. This relates to the way the Tralfamadorians see the world, since they can see all moments in time, at once. An example of this is when Vonnegut describes a character in the prison camp with Billy. It is said that he has the healthiest body out of all the prisoners, but then he says that "[the man]'s son would survive the war. [the man] wouldn't. That good body of his would be filled with holes by a firing squad in Dresden in sixty-eight days. So it goes."
It seems the themes in this book are free will, and fate. The Tralfamadorians see everything about the universe, just as it is, just as it is fated to be. They said to Billy that Earth is the only planet they have encountered where the inhabitants believe in free will. This makes me think that this is because humans don't possess the power to see in all times, thus making them believe they can control and change what happens in the future. This, in a way, is ignorance, which is also said to be bliss.