Mr. Monk Meets Dale the Whale - S1-E4
Revealing mistake: When Monk is showing how Dale and his Doctor murdered the judge one can see that the knitting of the right chair is already cut to ensure that the policeman will fall through it when he later steps on it.
Revealing mistake: While Horatio and Alexx are examining the prostitute's body, you can see the corpse breath in a side view.
Revealing mistake: As Bunk is ordering ballistics to rush comparisons, the dead bodyguard is breathing during the scene. (00:01:55)
Forever Red - S1-E34
Revealing mistake: When TJ "Shift's into Turbo" He misses the morpher with his key. The key goes behind his arm.
Revealing mistake: The left pinball in the arcade (which later disappears) has the body of a "Star Trek TNG" machine - but the backglass is purely fictional. (00:17:45)
Volleybrawl - S3-E17
Revealing mistake: The same shot of Ceri's team missing the ball and the oposing team winning the point is used several times. You can tell it's the same shot by the way a certain character jumps.
Revealing mistake: Air Force Colonel Owen Crawford and his two personal assistants are poring over classified intelligence files in the Colonel's office. When they start to review a slideshow of photographs, one assistant sets up a projector screen and turns off the office lights as the other assistant switches on the slide projector. Photographic images immediately appear on the screen in the background, but the first assistant is still standing directly in front of the slide projector in the foreground. Not only does he not eclipse the projected image on the screen, but no projected image appears on the assistant's body. Obviously, the images on the screen in the background are projected from another source far off-camera. (00:48:50)
Revealing mistake: The list of intelligence agents names that Johnny Marks steals is a list of the same names repeated over and over again.