While the original trailer for The Hobbit: An Unexpected Journey gave us much to ooo and aaa over, it was decidedly lacking dwarf. That oversight has been remedied. By simply pointing the camera downward, Peter Jackson discovered that there were dwarves in those scenes after all, and now all thirteen are introduced.
If you’re bad with names, I suggest making space in your memory palace for Fili, Kili, Oin, Gloin, Thorin Oakenshield, Dwalin, Balin, Bifur, Bofur, Bombur, Dori, Nori, and Ori. Perhaps creating a pneumonic device will help.