Continuity mistake: Willona's ex-husband had 3 different names: Alvin, Ray, and Roger.
Springtime in the Ghetto - S1-E10
Continuity mistake: In one scene, the plaque Florida wins is on the wall before she actually wins it.
J.J. Becomes a Man: Part 2 - S2-E3
Visible crew/equipment: While J.J. is in the police station cell with the mean prisoner who had beaten up five guys, J.J. quips, "A hundred prisoners in the jail, and I got to be in a cell with George Foreman." Then, in the next shot, the boom mic dips into view at the top right side of the screen. (00:12:25)
J.J. Becomes a Man: Part 2 - S2-E3
Visible crew/equipment: At the police station, when Florida is begging James to borrow money from the loan shark, she and James stand up; Florida is on the left, James the right. At the top of Florida's head behind her, you can see the microphone dip into view overhead, and it moves quickly out of the frame. Then it's visible again as Florida and James walk toward the loan shark. (00:18:00 - 00:33:00)
Continuity mistake: In this episode, the doctor says that JJ still has his tonsils; in "The Gang Pt 2", it is mentioned that JJ had his tonsils removed.
Other mistake: The FBI agents call for a taxi and official transportation from the Evans apartment and gave the address of 963 North Gilbert. However, the Evans lived at 921 North Gilbert. Since the FBI was at their apartment, you would think that they would know the address or exactly where they are in a Chicago project. (00:13:03 - 00:28:29)
Character mistake: James mentioned to Florida that he always knew his father was alive (after claiming to Florida he was dead in the past). But since James hasn't seen or heard from him in 35 years, there would really be no way for James to know that his father was still alive for sure - more like just a guess than certainty.
J.J.'s Fiancee: Part 2 - S3-E18
Continuity mistake: At the beginning of the show, JJ's girlfriend is wearing a shawl and the buttons are miss-buttoned by one button. In the next scene, the shawl is buttoned correctly.
A Stormy Relationship - S4-E19
Continuity mistake: 1/3 through the program, Michael is given his father's tool belt by his mom and he puts the strap on his shoulder. The next shot and for a few after, the strap is gone. Then it comes back again.
Other mistake: JJ says that everybody else in the office just has to look at their watch when the boss asks them the time but he has to go outside down the block because he can't afford a watch. Throughout the whole scene, you can see a wristwatch on his right wrist. He even raises his arm where his sleeve moves to his elbow to show it. It looks like a pretty expensive watch too. (00:05:00)
Visible crew/equipment: After JJ gives Michael his little black book, Penny spots Boom-Boom's numbers. When Willona walks over and sits on the back of the couch, her mic transmitter wires are hanging out the bottom of her sweater behind her. Then, when JJ doubles over in pain, the bulge of Willona's mic transmitter is visible at her lower back. (00:04:15)
Answer: Carl did die of lung cancer, that's why she returned to her family.