Angel Batista touches the evidence (postcards) with his bare hands.
Standing in the doorway of Kyle Butler #1's home, looking outside to the right (in front of a window) is a crew member's step ladder.
It was not a crew member's ladder. It was the ladder that Arthur stood on to "break in" to the house.
It was not a crew member's ladder. It was the ladder that Arthur stood on to "break in" to the house.
As Dexter approaches the door at Kyle Butler #1's house, the shadow of a shoulder-held camera appears to his right.
Random shadows don't automatically default to being a camera's shadow.
Random shadows don't automatically default to being a camera's shadow.
In Lost Boys (2009), it's discovered through a DNA profile that Christine is related to the Trinity Killer. Miami Metro heads to her apartment to arrest her and knock on the door. As Christine is heading to open the door, she calls out "Daddy" (rather loudly) before opening. However, as Batista is interrogating her, he has records that reveal information about her mother, and since her father isn't listed, asks her who her father is, to which she replies that she never knew her father. Since both Deb and Batista were closely leaning at her door and the rest of the team were in the hallway quietly awaiting Christine opening it, everyone should have been an ear-witness to her calling out "Daddy", which would prove that she not only lied about never knowing her father, but that she was apparently expecting him at her apartment.
When Dexter communicates on the CB radio that he is looking for Stan "The Man" Beaudry, the response is that he is at "Freddy's Truck Stop", yet Dexter pulls into a truck stop with many clearly visible signs reading "Big Phil's Truck Stop"
When Arthur looks in the Greater Miami phone book for "Kyle's" address, some of the phone numbers appear more that once to different people.
When Debra gets up to remove Lundy's name from the white-board, the costume clamps on the back of her shirt making it fit become visible.
Arthur Mitchell is as good a lock pick as Dexter is and too intelligent to try to break in to a house via the window facing the street.
The police would have had the kidnapped boy meet with a sketch artist, to create a sketch of Arthur. After it was shown on the news, someone would have recognized Arthur and called the police. Arthur had been a school teacher for many years, and he was involved with his local church, so many people knew him.