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.
Visible crew/equipment: When Monica stops the car, as Frank is getting out, you can see two cameramen in the reflection of the window. Also, a train is passing by but during the shot where Frank gets angry and makes a mean face at the camera, cars are passing along as if there is no train at all.
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.