Jeff has done a nice job (especially in plugging himself), but you could ask a few more things if you want. If you interested in breeding, asking about any hets, or possible hets, can be a plus. A good breeder may not have everything listed, but probably knows anyway and will divulge the info if asked. The really big breeders, like Rich, usually have important hets noted on each individual, but possibly not all known or potential hets. They simply can't do all that with the thousands of hatchlings they have. But it never hurts to ask as you never know...even Rich might have certain hatchlings that he remembers off the top of his head what the parents exactly were.
Some breeders, especially the smaller ones, may even have full feed and shed records with them...or could send them to you after the show..if you ask. Asking about ACR registration is also a good thought.
Asking to see if the breeder has other hatchlings under the table of the same type you're looking for can also be a plus. Some breeders just don't have enough room on the table for everything and I've often found the perfect snake "hiding" that I would have missed if I hadn't asked.
Asking about guarantees and getting things in writing as well as contact information can help in telling the better breeders from the rest of the crowd. The shows are terribly busy so if you don't ask for a receipt, you may not get one. And even then, you may just get something scribbled on the back of a business card. But that is really all you need and if the seller refuses to do even that...walk away.
A final note...don't be afraid to ask. It may seem that the person on the other side of the table is too busy to talk, and maybe they are busy with another person, be courteous and wait your turn, but let them know you wish to talk to them. But if they ignore you or say they don't have time to talk,then, IMO, find someone willing to spend at least a moment answering your questions.