Well, some authors mark certain threads by the title entry, like 'Backstage: Whadeva', which marks the episode as being part of the Backstage threads. Sometimes the thread label gets abbreviated, like the recent 'AA:' thread, short for 'Anna's AddVenture'.
As for the beginnings and ends... Sorry, it's rare for there to be a clearly-visible marking. The best I can advise is to look up Adama's Storyline Tree. It's a bit confusing to navigate, but that's the AddVenture's fault, not Adama's. It does cover a lot of the major plot twists throughout the AddVenture up to the beginning of this year (he's a bit behind, sadly).
Hope this helps.