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 name and numbers. When Willona walks over she sits on the back of the couch, and the bulge of her mic transmitter bodypack is visible at her lower back, with the transmitter wires also hanging out. (00:04:15)
Answer: Carl did die of lung cancer, that's why she returned to her family.