Mr. Monk and Little Monk - S4-E8
Continuity mistake: In the flashback scene of the kids in the school hallway, the autographed photo of Patty Duke disappears and reappears twice on the inside of Little Monk's locker door as the camera angles change.
Mr. Monk and Little Monk - S4-E8
Continuity mistake: When the kids are standing in front of the lockers, one of them is holding Monk's clarinet. The position of the instrument in his hand keeps changing between shots, from bell-up to bell-down, then bell-up again.
Mr. Monk and Little Monk - S4-E8
Continuity mistake: After the principal takes the stolen money, he shows the $5 bill he wrote on. But in the close up, the bill changes and so do the way the fingers are positioned.
Mr. Monk and Little Monk - S4-E8
Continuity mistake: When Monk is doing the summation for the present-day case with Sherry's ex-husband sitting in the chair, at first you can see that the painting is directly behind him. However, shortly thereafter during the summation, the painting has somehow shifted to the viewer's left and is no longer directly behind him. While it's plausible that someone could have moved the painting, it's just not believable since less than a minute has passed. Besides, would Lt. Disher (he was closest) really take it upon himself to move evidence?
Answer: Notice also that in the opening credits scene when he is touching parking meters her also wipes his hand on his clothes each time he does it.