Visible crew/equipment: Near the end of the episode when Harry says "there will be a 10 minute recess" a boom mic is visible.
Continuity mistake: In the first courtroom scene, Hacksaw is standing up twice.
Continuity mistake: In the first courtroom scene Sheila's briefcase opens and closes a couple of times between shots.
Dan's Boss - S3-E7
Continuity mistake: Near the end, when Dan sets the books and folders down to get a salad, the folders on top slide off the books. Dan ends up leaving it as is when he walks away, but in the next shot the folders are back on the books.
Revealing mistake: When Judge Stone is flipping down the hall out of excitement, you can tell it's his stunt double as his face appears on camera after the cartwheel. It appears his bow tie is missing too.
Continuity mistake: When Harry and Christine are talking, Christine is building a house of cards. The top card keeps changing between a four and a five.
Continuity mistake: Christine walks up to the bench, Harry is holding the invitation. The shot changes and he is no longer holding it. The shot changes and he is holding it again.
The Trouble is Not in Your Set - S6-E14
Continuity mistake: Christine walks in after brushing her hair. Her hair changes throughout the scene.
Continuity mistake: While in the courtroom Bull walks up to Christine, Dan, and Harry. The shot changes and he walks up to them again.
Continuity mistake: After the first courtroom scene people are walking out. The right door is open and the left closed. The shot changes and now the right is closed and the left is open.
From Snoop to Nuts (1) - S6-E18
Continuity mistake: When Roz and Christine are talking in the cafeteria there is a coffee mug in front of Roz. The shot changes and she is holding it.
From Snoop to Nuts (2) - S6-E19
Continuity mistake: When Roz and Mac are in the cafeteria, Roz puts her coffee cup on the table but still has her hand on it. The shot changes and her hand is no longer on it.
Continuity mistake: When Bull shows Harry the bag of cockroaches, Harry has his gavel in his hands. When Bull walks away he suddenly has a pen in his hands.
Yet Another Day in the Life - S6-E22
Continuity mistake: When Mac calls the Becker case, Harry is holding a pencil. The shot changes and he is no longer holding the pencil.
Yet Another Day in the Life - S6-E22
Continuity mistake: During the case with the Star Trek fans, in one shot the gavel in front of Harry disappears.
Come Back to the Five and Dime, Stephen King, Stephen King - S7-E4
Continuity mistake: In the opening scene the kid on the left's mask keeps changing from on to off between shots.
Continuity mistake: Mac says he went through Marine Corps boot camp, but in the flashback in 'Crossroads', he's in the army.
Other mistake: When Mac shows the news crew how he can call up a lot of info on his computer, the video game Super Mario Bros. appears on the screen but, the music that is playing is from the video game Super Mario Bros 2.
Factual error: When people begin to describe their symptoms, Dr. Deyoung says the "virus" could be a number of things, but then lists bacterial diseases. Something a doctor in his field would not do, especially since the test tube that broke was already described by him as "experimental bacteria."
Continuity mistake: Miss Hendley leaves the courtroom after Christine invites her to the Christmas party, she is leaning against the bench. The shot changes, and her arm is now on the bench.
Answer: It's possible when Harry called the military, he implied that the book contained sensitive information, seeing as how many government and military officials were part of the client list.
I thought it was because he developed feelings for the madam and couldn't bring himself to turn her in.