When getting prepared for a reading sometimes cards fall out, I put them back in the deck and continue but they come out in the reading as well. Does that mean it was giving me the answer before I lay them out? Or saying pay close attention to the individual card/s. and their meaning...

When cards fall out,
It really depends on the reading,
I had one the other day, I was doing a reading online, I wasn't quite sure of the situation, I shuffled, a card came out, I read the card and used that to determine the subject for the reading,
If the person is sitting infront of me, a card comes out  I'll hand them the card, tell them what it means,

I had a friend over the other day, she was going thru whats on her mind,
I was using the fairy oracle cards, the card that came out was one that said EXACTLY what she just got done saying,
I told her SEE you are being heard, they just repeated what you said!

It was the funniest thing.

So they actually are just putting an emphasis on what is being questioned or needed!

Right that's what I take them to do.
Everyones different though

The whole nature of the tarot cards is to get inside you (or your query).  My opinion is that they jump out for a reason so I pay attention to them.  Sometimes they may bring another extra element to a reading that you might not have considered before.  I think it's up to the "gut" of the individual to question why that card tries to get your attention.  

You can always attempt a clarification card for the falling cards.  Maybe it will thread the story together for you better.