When Dexter leaves the marina to go fishing he has four fishing poles standing up on his boat, but after the camera cuts to his hands the poles are gone.
Dexter's boat changes between shots. When Dexter leaves to go fishing, his boat is shown from the rear. The very next shot of him heading out to sea shows a completely different boat (different engines and seating, chrome vs. black steering wheel)
When Dexter (in S3E5) preps to leave for Bimini, he loads the fishing rod holders just behind the operator's chair with several fishing poles. Later, as Dexter zooms away (with camera on the dashboard and looking back at Dexter and the boat's rear), the fishing rods are gone.
When Dexter is searching for Ethan Turner on the Law Enforcement Database, after he hits enter, "Volkswagen Rabbit" flickers briefly before the screen switches to "searching". This is one of the search parameters that he used when looking for Teegan in the same database in Finding Freebo (2008).
Dexter is shown golfing swinging left handed but later he's looking at a right handed putter.