Bill (Richard Speight Jr.) is dressed in a Allied States Army uniform, his name tag reads Muck. This is the last name of his character, Skip Muck in the mini-series Band of Brothers (2001)
When Beck's men begin to march on Main Street, two men can clearly be seen with name tags reading Steinberg and Turtletaub. Jon Turteltaub is the executive producer and director of the pilot and Jonathan E. Steinberg is an executive producer
Morse Code during the opening title says: Know our flag
When the military calls in reinforcements to lock down Jericho. If you look at the 2 men marching on the right at 30:35. Their name tags are "Steinberg & Turteltaub" which are the names of one of the creators Jonathan E. Steinberg and the director Jon Turteltaub.
The show takes place in Kansas, but the end of this episode makes reference to an area near Dayton, OH. Route 48 between Alex-Bell and Lytle Five-Points is a real place. It's a five mile stretch of road like they say in the episode.