The first time it was shown, the tiny mirror was attached to the doll's right hand. Here, the mirror is shown attached to its left hand.
In the flashback scene where Harry Morgan is practicing his eulogy for his partner, Davey Sanchez, he is wearing a Class-A uniform. On the sleeves, he has Sergeant stripes. Throughout the entire series, there is no mention of him reaching a rank above Detective. The Sergeant's stripes are sewn on upside down, with the Chevron pointing away from his shoulder.
When Dexter's browsing the reports about Matt Chambers' past DUI infringements, the last page shows the title of an article in South Boston Daily claiming "Matt Rasmussen of South Boston Arrested" though the rest of the article is about Matt Brewster - a name used in Albuquerque. The article is identical to the previous one in Albuquerque Times Standard except for the first couple of words.
When Angel and Dexter are showing the DNA evidence to Laguerta and Doakes, the laptop screen shows that the DNA came from "Jimmy Sanders" and "Residence: Jimmy Sanders", even though the two samples came from Ricky Simmons and the residence of Ricky Simmons. There is no one named Jimmy Sanders anywhere else in the episode.
When Dexter peeks through his window a powerful stage light is visible illuminating the apartment is if it were sunlight.
During the double date scene at the Miami Beach restaurant, there is a rock wall in the ocean beyond the beach. There are no rocky beaches, much less rock walls in front of Miami Beach.
When Dexter finds the cell phone under the couch, he calls Angel to retrieve it. Angel promptly kneels directly in blood evidence to reach for it.