Jon Bernthal and Frank Dillane are part of The Walking Dead (2010) universe. Bernthal played Shane Walsh on The Walking Dead, and Dillane plays Nick Clark on Fear the Walking Dead (2015).
Jeremy Allen White's name in this film is Freddy. Jeremy plays a character on Shameless (2011) named "Lip" and his character on Season 10 had a baby boy named Freddy.