I am sure that there are a lot of good replies given at this thread but I do not want to read them all. First off, if you feel the judges are not forthcoming with info such as the rabbit shows you describe, that is the way poultry shows are. Each species judges differently, and rabbit judges are trained much differently than poultry judges.
If you want answers to your questions, ASK them! However, as noted by other people, Poultry judges have a lot of differnt breeds to judge and usually MANY birds, so they will not be able to discuss things with the exhibitors till after all the judging is OVER. MOST of the time, judges are willing to answer questions unless they have to fly out or leave right away after the show for scheduling issues. Plus, also keep in mind that while judges are supposed to be "unbiased" to different breed, there are some who totally HATE some breeds (Have had this happen) and will place them all poorly. Saw a judge one time who totally refused to handle the silkies in a featherleg class so another judge had to judge them. Judges in poultry are often rushed, and they can miss things and mistakes occur.
The best thing to do is ask other exhibitors about the breed your curious about or if you are showing, ask others who show the same thing. I know I NEVER have a shortage of people asking questions to me at a show and no question is too stupid to ask. Heck, I even gave a AI demonstration last weekend to a few ladies from here. I give all the answers I can, it is good to spread around what you know to get others int he hobby.