This year I'm NaNoNOTWriMo-ing courtesy of a temporary contract extension in the day job and a tricky timeline rewrite in the centre of my manuscript. The suggestion from my crit group to improve a single chapter means rewrites both back and forward from that spot and sadly, the continuity of "who knows what and when" is doing my head in. Cue a collection of post-it notes spread across one side of my desk to set it in stone. Now I just have to ensure I've incorporated it all.
Good luck to those wielding their pens towards the 50K goal - I wish you speedy words, plenty of writing time and no unforeseen disasters.