Continuity mistake: In season 2's "Divorce with Extreme Prejudice", Douglas Brackman has two children; in Season 6, he only has one child.
Audio problem: When Benny is talking to Rosalie and his friend who hired the band shortly before the wedding, Benny's mouth movements don't match the sound.
Factual error: Early in the episode it was established that Rosalie and Benny are to be married on Saturday. When the ruling is being announced on Halliday's case in the courtroom, she tells her father that they have to get ready to go to a wedding in a little while, meaning that they are in court on Saturday. Court is held Monday-Friday.
Revealing mistake: Abe Lassen's hair color changes throughout the episode.
Continuity mistake: Tommy Mullany is standing in his office with a phone in his right hand, with a cigarette in the same hand. In the next shot, Roxanne comes in to speak with him, but the cigarette is now in his left hand. (00:08:45)
Testing, Testing, 1...2...3...4 - S7-E20
Plot hole: Gwen Taylor tells her Bar prep instructor, Tony Henderson, that she does not have a law degree and that she has been apprenticing. This would indicate that she did not go to law school. But in 6-01, she tells Leland McKenzie that she was accepted to Loyola Law School and that she was thinking about going. Leland convinces her to go. In multiple episodes, it is made clear that Gwen is attending law school. Frank Kittredge helps Gwen understand the famous Palsgraf case, as well as the principle that came from it, "proximate cause." Additionally, Arnie tells Gwen that she will need to pick between her job and law school. Additionally, while sitting in on a staff meeting, Gwen asks if it's a bad time to discuss "res ipsa," which is a reference to the legal doctrine, "res ipsa loquitur," a torts principle that came from the case, Byrne v. Boadle (indicating that she was taking a law school torts class). There was no indication that Gwen left law school for an apprenticeship. (00:29:40)
Continuity mistake: Both of the young associates, Leslie Kleinberg and Anthony Gianelli, leave the firm. But in S2E5, they both appear at the morning meeting typically shown at or near the beginning of each episode. This episode seems to be completely out of order.
Continuity mistake: During the scene with commercials, when Stewart is talking to Benny while on a treadmill, he is reading a book which he closes at one point. As the shot changes back and forth, the book binding is facing his right hand, then his left and tips down slightly, then goes back again.