The character "Julia Shumway" - the red-headed reporter, shares her last name with an extra terrestrial sitcom character named Gordon Shumway, or more commonly referred to as "ALF." This could be an Easter Egg by Stephen King or Steven Spielberg to reference Under The Dome's alien themes.
Before it was renewed for a second season, Britt Robertson was only signed on for 10 of the 13 episodes in the first season. But, she was kept on the show for 5 more episodes and guest starred another.
In the episode "Awakening," Big Jim, played by Dean Norris, looks at himself in a mirror then lays his hand on a bible lying on the top shelf of his locker. Next to the bible is a black pork pie hat simular to the one Walter White wears in AMC's Breaking Bad, of which Dean Norris also had a leading role.
Within the course of the series Dean Norris assumes a role as an officer of the law in Chester's Mill. Norris previously played as a member of law enforcement in a small role in Lethal Weapon 2 (1989) as Detective Dick Cavanaugh. He also played a SWAT officer in Terminator 2 and a DEA agent in Breaking Bad.