Trash has the potential to become an ongoing problem. I too noticed a general lack of trash cans, and not just in the dealer's room. At Sakura Con, trash cans fill up so quickly that they're often all overflowing by evening. They've had this problem for years, so it's obviously something that will require a lot of attention at Kumori Con.
In the future I want to look even one step beyond trash cans: recycling. I don't know about you, but I feel an obligation to attempt to recycle as much as we can during the convention. I hate to see so many people join to enjoy something they have in common, only to leave the hotel having thrown away more trash than they ever do in daily life, but worse yet, recycle none of it. If I have the time, I'm going to volunteer to look into alternatives for next year.
I also have an example from Sakura Con regarding bootlegged merchandise. Well, it was actually Hong Kong bootlegs... so they were technically legal, but many of us have principles against buying them. When I found out I'd accidentally bought several Hong Kong soundtracks (naive as I was...the price didn't tip me off), I got upset and complained on the forums. The chairman assured me that they too were unhappy to find out about it and would definitely enforce it in the future.
That was way back in 2000. However, the same CDs have been somewhere in the dealer's room every year since then. Perhaps the convention had trouble preventing their sale, as they are legal items, and often carried by some very major dealers.
Now, I heard about one fiasco at the dealer's room: one dealer was selling these Hong Kong CDs for full Japanese import price. That means that you'd have to look quite carefully to identify that they weren't authentic. The only table I saw selling Hong Kong CDs had the standard $15/disc price. Does that mean the one with the jacked-up prices got kicked out? I wasn't there to see it when it happened, if it did.