Episode #3.6 - S3-E6
Continuity mistake: During the first whiteboard scene, you can tell different takes have been edited together because in some of the shots with the same angle (Danny John-Jules from the waist up) something happened that smudged away a bit of the vertical stroke of the first T in Matt Webster's name, and in others it is untouched. (00:15:40)
Episode #3.6 - S3-E6
Continuity mistake: At the setup of the whiteboard, the name of the victim is shown in close-up. The letter R in 'Mark Talbot' is written with a full eyelet and the K has its oblique strokes that don't join together. In the next shot Dwayne is standing by the board and the writing changed. The mistake happens for the remaining names too, different between close-up and view of the whole board. (00:15:35)
Episode #3.6 - S3-E6
Continuity mistake: Chief Goodman has implicitly outed himself as a birdwatcher, and the others look at him with pity. When Fidel resumes speaking saying "Well...", Humphrey lowers his binoculars and moves the evidence bag from one hand to the other and vice-versa. Besides small jumps in continuity that occur, the evidence bag does a 180° between shots. (00:05:30)
Episode #3.6 - S3-E6
Factual error: Humphrey and the rest of the crew arrive on the murder scene, where Fidel is taking pictures of the body. With the knife fully planted inside the victim and pictures still to be taken, Fidel is already able to say that the knife has been wiped clean of prints; it's impossible that he could have already done such an assessment at that point.
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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