When Prado first tells Dexter about Fleeter the computer clearly lists him as a linebacker, and Prado states, "He never went pro." In the news article Dexter finds online about Fleeter's arrest the opening line is, "Former professional football lineman, William "Billy" Fleer was brought in by police."
The story "Suspect Found in School Teacher Murder Case" is dated "Saturday, March 19, 2008" (a Wednesday) and refers to William "Billy" Fleeter being brought in for questioning on a previous Thursday regarding a deadly beating. His prison record shows he was in jail for drug possession at the time: arrested 02/15/2008 and released on 04/30/2008.
During the talk Dexter is having with Prado about calling off the kill; the freighter passing by behind them disappears in two or three of the shots.
The story "Suspect Found in School Teacher Murder Case" has a posted date of "3/19/2008 3:57 AM" but an updated date of "3/20/2006 4:29 PM", nearly two years earlier.
When Debra Morgan is questioning Joey Quinn about their C.I., her bang on the left of her face constantly moves from being tucked behind her ear to dangling down the side of her face.
The main newspaper in Miami is the Miami Herald, not the Miami Tribune. However, there was a Miami Tribune which existed as a newspaper in 1924.
When Dexter & Miguel go to set up the "kill room", the padlock on the door is already open but Dexter uses his lock picks on it.
The story "Suspect Found in School Teacher Murder Case" has spelling and grammatical errors including misspelling the name "Fleeter" as "Fleer", the word "common" as "commin", and having the sentence, "Two days later he was death."
When Maria and Ellen are at the bar, talking about the social event they've been to, in a close-up of Ellen, the side of Maria's face can be seen, with her lips closed and still even though she is talking.
Miguel and Dexter are discussing the code on the concrete pier. No such concrete pier exists in Biscayne Bay.
The IA sub plot makes less and less sense. Despite the crassness of Yuki's methods and the vagueness of her allegations against Quinn, Deb failed to take even a cursory look at Quinn's past. But now she suddenly throws these unsubstantiated accusations into Quinn's face, in a fit of rage with complete lack of impulse control.