As Stottlemeyer is looking at Monk's painting with fresh eyes, his watch disappears and reappears between shots.
When Randy is in the junkyard arguing with Bennie the junkyard owner over paying for the bicycle, from the camera angle looking at his back, the back and left arm of his suit jacket are covered with a spider's web. But from all the other angles, there's no sign of the spider's web. The spider's web also looks different in the two shots from the back - there's more of it in the second shot.
When Monk is inside Petya Lovak's van saying goodbye to the paintings and Petya is outside urging Monk to come out, Petya's standing position changes between shots.
At the art gallery when the female art student with black hair says, "I knew we'd have to be something," she puts her arms down at her sides. In the next shot, her arms are crossed.
When Monk paints the banana the back of the canvases are covered with white canvas. Later on the same canvases don't have the white canvas on the back.
Monk dumps gasoline over the paintings in the front yard. He then stands there with a flame from a lighter for several seconds. Finally he bends down and lights the paintings, but only a small flame begins. But with the amount of gasoline he dumped on the paintings there should have been a small momentary explosion.
At the very beginning when Hector greets Bennie Wentworth (in Spanish) at the junkyard, Bennie replies, "English! English! Learn English!" Bennie's mouth movements however do not match the first "English!"
When Petya Lovak runs outside Natalie's house and leaps down from her porch to try and stop Monk from burning the paint canvases, Petya yells, "They are worth a fortune!" But his mouth doesn't move.