"Not paying attention to detail and having parts left over makes you really go back and look at the book to see what you missed, Those little guns that shoot out. boy do they have power on them scared the little Lego's out of me. At the end I did end up with extra stuff and i must admit i'm not sure if they are extras or not I had gone over the directions over and over. (nothing) It's a great set! Do pay attention to details."