To answer the original post- A couple months ago they had the same deal at the Lego store in King Of Prussia, Pennsylvania. I asked the sales clerk if I could just pick out 15 different parts instead of building the three figures. He was very confused at first but let me do it in the end. I was able to get different hats, hair pieces, tools and so on. The parts bins at the KOP store are large and they carry (from time to time) some very rare parts. I guess it just depends on the sales clerk really and it's not like each piece is inventoried. All of the BAM parts come in weighed bags just like the PAB wall so it really shouldn't matter.
Almost forgot to list my findings- cowboy hats, top hats, rare colored hair types, a couple shirt types I've never seen, diver helmet, skull cap, skull & crossbones pirate hat, mermaid fins and beanies (wool hats).