When Dexter is being questioned in his room, he tells Amber that he found her lost earring. Monk notices that Amber's ears are not pierced and states that the earring couldn't have belonged to her, but later when Amber is receiving Sapphire Girl of the Year, she is wearing earrings for pierced ears.
When Elliott is being choked by the barbell, you can see his fingers indent the supposedly metal bar.
During the first inspection of the fitness room, a close-up shows two grippers lying on the table with the springs touching each other. The long shot shows the grippers in a different position.
When Monk first appears with the golf clubs, his left hand is touching the bag when seen from in front but hanging at his side when seen from behind.
In the final scene, Randy is under the table using the murder weapon (electromagnet).
In real life, a suspected murder weapon would be held in police custody to keep it from being tampered with.
In real life, a suspected murder weapon would be held in police custody to keep it from being tampered with.