the bount/vampire arc is non canon, and part of the whole anime-based-on-manga tradition of the studio coming up with an "original" storyline to animate while the manga-ka is writing new stuff. It's to keep the anime from catching up to the manga storyline. i.e. the naruto searching for sasuke arc where he goes on pointless missions as filler until the shippuden arc.
The stories are usually derivative or repetition of stuff that has happened before in the real storyline. My friends and I refer to them as monkey episodes, as the writing is representative of an infinite number of monkeys hitting away at an infinite number of typewriters for an indefinite amount of time. every so often something good comes out, but 99% of it you could live without seeing. I believe Bleach is back to the canon arcs.