I think for the entire race - even if you are eliminated - you are pretty much cut out from the outside world as far as communications is concerned. So unless you bump into one of your fellow AFFers on the road, no go for the advice giving.
Also, all of your travel is in Y (barring specific operational exceptions) and you're not going to be able to call on any of your status benefits or assistance as you go
The whole thing is filmed first
then is screened. Not one week filmed, edited then screened. That's how I think I read about it anyway. Eliminated contestants are treated to some vacation of sorts but otherwise are held in purgatory to stop them leaking more detail outside of the show. So if anyone is thinking of doing this, better tell your boss you're going on a loooooong vacation.
I'd like to enter but I don't think I'm TV-genic, so to speak, and the questionnaire by all means makes this quality clear for all contestants. They are looking for a dynamic bunch, not just a bunch of boring slobs, no matter how they make out their pitch that they are looking for 'everyday people'. Half of the questions sounds like something you might need to answer at a tough job interview, or psychometric test.