At Dexter's apartment, after he looks out to see if anybody is watching, the camera zooms in on Liddy's hiding spot, the plants in front of the window change and the shade disappears.
When Jordon Chase is sitting in his car outside Tilden's house, the back window of his car is opaque; but as he pulls away it's transparent again.
Lumen holds the knife with the sharp edge facing away from her. Dexter tells her to turn it the other way around. But in Take It! (2010), he kills Cole Harmon with the knife's back facing towards him.
When Deb and Quinn arrive at Alex Tilden's house, there's a huge black 4x4 SUV parked outside the house next door. In the next exterior shot as the camera pans over to that house, there's no vehicle there.
The street where Emily Birch lives is not found in Miami. The deciduous trees and clapboard houses seen don't exist in South Florida.