I read somewhere that Aldrin was extremely miffed that he wouldn't be the first, TTT. I also read that in one of the rehearsals, he actually did go first but damaged his spacesuit or a piece of equipment as he squeezed past Armstrong.
Also read that when the Lunar Module took off, the down-blast toppled the US flag over and that on subsequent moon landings, the flag was planted a good distance away from the craft so as not to suffer the same fate.