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Season 1 generally

Trivia: "Darkly Dreaming Dexter" - the novel on which season 1 is based - is actually significantly shorter than the season in terms of storytelling. In fact, roughly half the events described in the novel take place in the very first episode.

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Season 4 generally

Trivia: John Lithgow revealed in an interview with GQ that he initially turned down the role of Arthur Mitchell, a.k.a. the Trinity Killer. He was convinced to change his mind by his agent and his lawyer. He ended up winning an Emmy for the role, so he definitely made the right choice.

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Season 1 generally

Trivia: Some notable differences between season 1 and "Darkly Dreaming Dexter" - the first novel in the series of books that the show is based on - are that Deb and LaGuerta both discover Dexter's secret by the end, which doesn't occur in the show until seasons 6 and 7, respectively. LaGuerta is also killed by Brian, a.k.a. the Ice Truck Killer, whose true identity isn't revealed until the last chapter, and he is also referred to as the Tamiami Slasher. He also escapes at the end of the novel.

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Remember the Monsters? - S8-E12

Plot hole: In order to elude Elway at the airport, Dexter fills a backpack with random items and leaves it unattended under a seat, and then tells a desk clerk that he saw Elway deliberately put the backpack there and walk away, which leads to security detaining Elway and the airport being evacuated. Airports have security cameras everywhere, so security would have reviewed the footage and seen Dexter was the one who placed the bag there. They then would have gone through all security footage since he entered the airport in order to deduce his identity and then located and arrested him.

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Remember the Monsters? - S8-E12

Plot hole: A couple episodes prior, Deputy Marshal Clayton stated that he shared Hannah's picture everywhere after receiving a tip that she may be in Miami. In the same episode, Hannah was spotted at a hospital and Clayton was called in about it. This should have only increased public awareness concerning her, but at the beginning of this episode, she somehow made it through airport security and all the way to her gate before spotting Elway and hiding from him in the ladies room.

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Season 8 generally

Stupidity: Hannah spends the entirety of season 8 as a fugitive in hiding, but never thinks to make herself less conspicuous, such as dyeing or cutting her hair, or wearing disguises when she goes out in public.

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Monkey in a Box - S8-E11

Stupidity: Dexter's decision not to kill Trinity when he had the chance eventually led to Rita's death, a mistake Dexter told Deb he would never make again. However, at the end of this episode, he decides to spare Oliver Saxon so Deb can arrest him. Dexter doesn't stay to ensure that Deb successfully has Saxon in custody, which leads to Saxon escaping his shackles with the unwitting help of Deputy Marshal Clayton, and shooting Deb before leaving the scene. Dexter therefore does make the same mistake again.

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Goodbye Miami - S8-E10

Stupidity: After Dexter tells Hannah that the U.S. Marshals have distributed her picture everywhere, she questions how she will be able to flee Miami for Argentina. Dexter reasons he and Harrison can leave with her because the authorities won't be looking for a woman traveling with her "husband and child." It doesn't matter who she is or isn't traveling with. If the authorities have shared her picture, she's going to be flagged when she goes through security at the airport, which Dexter should certainly know. This is made all the more egregious when she takes Harrison to the hospital later in the episode and is ID'd by the receptionist.

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Swim Deep - S7-E5

Trivia: When Dexter is looking at Isaak Sirko's file on his laptop, the top picture on the column of three is a screenshot of Ray Stevenson in Punisher: War Zone. (00:23:58)

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Show generally

Stupidity: Dexter keeps evidence of his murders in his apartment, but never thinks to have any kind of security system such as motion detectors and cameras. This is especially egregious given that 1. The first rule of Dexter's code is to not get caught. 2. Sgt. Doakes broke into Dexter's apartment and found his blood slides, and very nearly used them to prove that Dexter is a serial killer, and 3. Dexter discovered that Stan Liddy bugged his apartment.

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Are You...? - S7-E1

Plot hole: It's out of character and against his code for Dexter to kill Viktor at the airport. Airports have security cameras everywhere (you can see one on the ceiling when he is wheeling Viktor into the unclaimed baggage storage), and using the unclaimed baggage storage as the kill room is equally unwise, because any airport employee could walk in at anytime and catch him red-handed. Dexter was caught murdering Travis Marshall by Deb just hours before, so if anything, he should be even more cautious.

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Teenage Wasteland - S5-E9

Revealing mistake: When Dexter stomps on Barry's kidney, you can see his foot doesn't even make contact with Barry's body.

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Waiting to Exhale - S2-E2

Revealing mistake: After Doakes remarks that the dead body of Eva is a message, you can see the actress' neck throbbing around where the trail of blood is. (00:06:49)

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Trivia: In this show, Christian Camargo plays Dexter's older brother. In real life, Michael C. Hall is 5 months older than Camargo.

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Morning Comes - S2-E8

Trivia: When Deb is telling Dexter that she has a date with Lundy that night, she remarks that he is 20 years older than her. In real life, Keith Carradine is 31 years older than Jennifer Carpenter. (00:22:30)

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Hello, Dexter Morgan - S4-E11

Continuity mistake: When Dexter is killing Stan Beaudry, the drop of Beaudry's blood encompasses the width of the blood slide when the two pieces of the slide are pressed together, but then goes to being roughly half the size when the shot changes.

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Blinded By the Light - S4-E3

Revealing mistake: When Deb is texting "Looks like it" to Anton, the buttons she presses on the keypad do not correlate with the message itself and the phone doesn't show any auto-correct feature being utilized, indicating that the text message was added in post production.

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Remember the Monsters? - S8-E12

Revealing mistake: In the flashback scenes when Dexter and Deb are shown holding baby Harrison in the newborn room, you can tell they are just holding a dummy in the wide shots because the baby never moves a muscle.

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