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.
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."
When Mario is apprehended, he is supposedly working in Bayfront Park. However, the park shown during the apprehension looks nothing like that park, which essentially is a large shopping center and amphitheater.
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.
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."