Continuity mistake: When Monica and Frank are driving in the car with Liam, the Crawford Power Plant can be seen just behind the car. At this point, they have crossed the Stevenson Expressway and they are heading south down Pulaski. However, in the scene where they stop the car and argue, as Monica drives away, the Crawford Power Plant can be seen on the left, right ahead of them.
Continuity mistake: After Fiona's return back home from the club where she's worked as a waitress, the blackish strips on her cheeks turn from partially rubbed off (justified by her wiping the tears) to perfectly fine a moment later, then change several more times during her discussion with Lip.
Continuity mistake: During Frank's discussion with the candidate for mayor, there's a bus leaving the stop, it's not the same vehicle. In the first shot, it's 1717, with no advertisement or line number on the rear, while in the second it's 1691 with an ad above the licence plate and the number 82 on the display.