Exactly. The hours are to get the interview, the interview is to get the job. The yellow folder thing is simply for them to know who has the 800/100 and who has the 500/50 mins since that requires a contract to be signed.

If you are invited for an interview, they want you! Fill out the paperwork correctly and honestly. One guy was still finishing it up in the holding tank during my interview. The guys said "Thats fine!" but I think gives a bad impression. Either way, he didnt last long. Read the gouges, know your stuff (91 stuff if you fly 91, 121 if you fly 121, etc). As for the HR, be yourself and just don't be "weird."