Michael Keaton was originally considered for the lead role, before having to drop out over schedule conflicts and Mark Ruffalo being ultimately cast instead.
The tattoo on Robbie's neck is composed of two parts: (zhong), meaning "center" or "middle," and (xin), meaning "heart."
The combination of "center" and "heart" conveys the idea of a sincere and unwavering heart, devotion or loyalty.
Delaware County, Pennsylvania ("Delco") accent, which its creators and cast consider distinctive and authentic. The cast worked with dialect coach Susanne Sulby, to achieve the authentic "Delco drawl" through immersion in the area, listening to local speech, and practicing specific phonetic sounds.
Jeff Lukeski auditioned for the role of Shane McReynolds but the part ultimately went to Colin Bates.