Well, for starters they swapped seats after takeoff, and only reswapped after descending below 10,000ft. The list is pretty long if you'd like me to continue.
Is this NTSB investigation NTSB ID:
DCA05MA003?
If you have any sort of evidence for that, I'd like to see it - that's not sarcastic; I just haven't heard that anywhere and it seems like something that'd be heavily reported. Likewise for any other violations. Also, I'm not even sure that swapping seats violates regs. I've got my FAR/AIM right here, perhaps you could quote me chapter and verse?