The Gang Runs for Office - S2-E8
Continuity mistake: When Mac is about to get in the cop's car he has a full hot dog. When he gets in there is no hot dog. (00:21:15)
Suggested correction: After we see him on the street, the scene cuts to him already getting into the cop car, and we never see his left hand or below his waist, so he could still have it with him.
Dennis and Dee Go on Welfare - S2-E3
Continuity mistake: When Frank, Maria and Tony walk in from playing full contact football, there is a white package behind the ash tray, when the shot switches to Frank the package is gone, when the shot switches back to Maria and Tony the white package is noticeable again. This happens 4 times. (00:18:00)
The Gang Exploits the Mortgage Crisis - S5-E1
Visible crew/equipment: When the gang realizes the family is still residing in the home Frank has just purchased a verbal quarrel ensues, obviously. In one of the shots you can see a good bit of a crew member on the left side of the screen. (00:05:40)
Revealing mistake: As Mac and Dennis are wheeling themselves through the mall, they pass by a clothing store where a man and woman are standing by the entrance. The woman notices the camera and waves at it. (00:15:22)
