I read spoilers and I still didn't like it. I dropped it a long time ago near the kage summit arc. *Note that does not pertain to this guide: My thoughts on Naruto ATM If you are one of those people that want to see those couple of minutes: look through this forum post and you'll see people discussing them. If its like SUPER LIFE CHANGING OMG SUCH WOW couple of minutes then I'll make a note but other than that it is not being mentioned. I'm pretty sure it will be mentioned again in some other episode. I'm still counting it as filler and not making a note of it. *Note: Also, on the topic of a couple minutes of canon in one filler episode.
Its great that Kishimoto has novels that expand the universe, however if its not in the manga directly its not going on the guide. Unless a filler arc is magically in the manga I don't see myself making a note of it or adding it. Check there for more current and better updates! Also, check the bottom of this guide for more indepth guide! My list is very similar to this guide ' '.
If you don't like this guide there are many other filler guides out there do the job better. The guide is perfect in its current state. *Note: I will not be making updates to this guide in the future. 261 - 321 Fourth Shinobi War: Confrontation