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.
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.
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.
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.
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.
The Trouble is Not in Your Set - S6-E14
Continuity mistake: Christine walks in after brushing her hair. Her hair changes throughout the scene.
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.