ok. Speaking as a home brewer and huge Alton Brown fan... let's cut the guy some slack. Honestly, what do you expect from a half an hour cooking show?
Sure, he screws up some of the lingo and I would probably be hard pressed to actually drink the beer that he brewed on that episode, but I'm also willing to bet that that episode may have introduced a few people to the concept of home brewing that may have known nothing about it, beforehand. I know, for me, I saw Emeril Lagassi (or however the hell you spell his name) make some beer on TV once, about 10 years ago and, though I don't remember the details I'm sure they were way off, too, but seeing it done on tv like that was enough to spark my interest and see how easy it really is to get started.
If you try it and like it, you are going to want to learn more, branch out, and seek more reputable, in-depth sources of information and improve, from there.
I look at this episode as more of an advertisement, than anything else; it was an opportunity to spark interest in home brewing with a larger, more general audience.