Why was Scott so impressed that Maxina was able to get BET footage over to NBC (p. 143)?
Because of the "great corporate gorge" Maxina had to jump. In this age of excess synergy and cross-conglomerate competition, it's not so easy to take hot Viacom-owned footage to a non-Viacom station, especially when a fellow Viacom property (60 Minutes) wants a lock on that footage. This is just part of the fun and games that go on behind the scenes at our venerated news orgs.

In his plan to deal with Harmony, Scott is determined to tell her everything, but then admits there will be "one or two creative omissions." What are the omissions?
One: he won't tell her that he's recorded their initial conversation as insurance in the event that she goes rogue. Two: he won't tell her about Lisa Glassman, for reasons he explains on page 197. I figured if she knew about Lisa, it would be all too easy to convince herself that Hunta really was a sexual aggressor... Harmony would have plenty of motivation to skip out on her mea culpa. I didn't want to add more.

Both omissions, of course, later come back to bite Scott in the ass.

There seems to be a running joke in this chapter (among others) that Scott is uniquely non-descript. What does he look like?
All he's willing to divulge about his appearance is that he's tall (6'6", to be precise) and white. A few other characters (notably Miranda) have revealed that he's handsome in a non-descript sort of way. For some reason, I picture Scott looking like Michael J. Fox after being stretched out on the rack. But your mileage may vary.

As to why Scott doesn't really describe himself, that's just his way. If you notice, he doesn't really wax eloquent about anyone's description. A poet he ain't.

Is Scott's history of the hostess club true (p. 151)?
Truncated, but true.

Are there really only a handful of these clubs left?
In the U.S., yes. But from what I gather, they're still the rage in Europe and Asia. Further proof that America has lost its sexual imagination.

Is the Flower Club fictional?
Right down to the Naugahyde couches.

What's the deal with "Dave" from Richmond?
Surface answer: "Dave" is an intelligent and affluent businessman who is simply too old and too jaded to search for a future third wife. So he relies on hostesses to fulfill his need for non-sexual intimacy.

Deeper answer: "Dave" is a grim portent of Scott's future, as long as Scott keeps the world at arm's length. Is it any wonder why Scott leaves the Flower Club so thoroughly disturbed?