Continuity mistake: During the opening sequence of every episode, Dexter prepares for his day. The first thing he does is shave and then fixes breakfast. But by the time he starts eating, he already has long stubble.

Dexter (2006)
1 continuity mistake in show generally - chronological order
Starring: James Remar, Michael C. Hall, Jennifer Carpenter, David Zayas
Factual error: In the newspaper article from the Trinity killers past - the report states that someone called 911 and dispatch gave them instructions. The death occurred in 1959. The first 911 call was made in 1968. (00:39:24)
This Is the Way the World Ends - S6-E12
Dexter: I am a father, a son, a serial killer.
Question: The DNA test is a match, but later in the 2-3rd season we discover that Harry (foster father) had an affair with the real mother. Is Harry the real father and takes him but not his brother in because of that or not?
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Answer: No, Harry is not the real father. While he did have an affair with Dexter's biological mother (Laura Moser), this was when she was his C.I. Dexter was already born at that point.