Sarah says Gruber is one of 5 people who can hit a target from half a mile away. Usually sharp-shooter distances are in yards or meters. There are many snipers who can make 1000 meter shots (well over a half a mile) and there have been several confirmed kills at over 2000 meters.
Approaching his apartment for dinner, Chuck says, "Now, everybody keep your expectations low; I'm not Chef Boyardee". Today the Boyardee name is known for mediocre to crappy canned pasta, something cheap that a harried mother easily feeds her children. However, by 1920 Ettore Boiardi was one of the most respected chefs in the US and had been chief chef at some of the most famous restaurants. When he started canning his sauces, he changed the spelling of his name so Americans would pronounce it properly.