Allison Janney played Sheila Jackson on the original pilot, but when the producers decided to expand the role, Janney had to drop out because she was a full-time regular on Mr. Sunshine (2011), so Joan Cusack was cast.
Though in episode 1x03 ("Aunt Ginger") Mickey tells Lip his mother is picking up a family member from Juvie, in later episodes there is no mention of the Milkovich's mom other than Ian telling Mandy Milkovich she's lucky her mom is dead.
A unique presenting trademark is a main characters' breaking the fourth wall at episode beginnings, inquiring as to why the viewer supposedly did not view the previous episode before recap flashbacks with unaired scenes.
Shameless is an American remake of a British show. The UK counterpart (same title) is set on the Chatsworth council estate, a fictional borough in Manchester. It originally ran from 2004 to 2013 for 11 series and 139 episodes.
Originally there was a scene on the season 3 finale where the Brasilians played hockey with Jimmy's head, an clear indication to the audience that the character had been killed. They even made a fake head after Justin Chatwin, but they chose not to show the scene in case they changed their minds about killing the character. Creator John Wells said publicly that the character was dead, but ended up bringing Chatwin back for a few episodes to write him out of the show properly and wrap up his storyline with Fiona.
Though Shanola Hampton (Veronica Fisher) became pregnant around the same time her character did, Hampton claims it was coincidence and that the pregnancy storyline has always been the plan for her character