The one thing that has puzzled me since the start was that all these people had a flashforward and saw either the future or a memory from the future, but not one person in the future went oh this is that day I remember from my flashforward (its not like they would have forgotten about it in six months would it) not even the odd oooo de ja vu
The other stuff doesn't really bog me down because its always been the constant questions about seeing the future - if you see something and you try to prevent would you have already done those things to reach that point in the future and thus would mean it remains the same. Or does seeing the future mean you can change it because you know what you will be doing so you stay off from work that day. Its always been the arguments and paradox's that will befuddle people until seeing the future becomes true.
But it does puzzle me that no one in the flashforward rememebered that today is the day I saw in my vision. You can't say they don't know about the flashforward because the cop is looking into the flashforward so it happened. The only thing I can think of is that it was not a memory and peoples conciousnesses were transported into the future so it was present day concious in future body and thus they were not quite with it (but then that has holes too - why were people acting like they were in the future? where did the future conciousness go?) So really I just think its a wierd plothole.