Continuity mistake: Dexter kills Jimenez with a chainsaw and is wearing an apron. But he gets blood all over his shirt. He leaves in a hurry after getting a call from Rita about her door being unlocked and him having the only other key. When he shows up, there is no blood on the same shirt he was wearing.
It's Alive! - S2-E1
Continuity mistake: When Batista is saying to Dexter "Did you even take my advice, Jose?" Doakes is not in the background. The next shot he is back in his spot. (00:10:00)
Continuity mistake: Dexter's hybrid SUV changes often. Sometimes it has satnav, sometimes it doesn't.
Continuity mistake: When Lumen stabs Dexter with his knife in the swamp, she hits right above his elbow which he grabs promptly. When the camera angle changes, he's now grabbing his upper arm that's bleeding from a different spot than where he was stabbed.
Continuity mistake: In the scene where Dexter is playing a video game on Miguel's office computer, Miguel is shown to close the game down. But in the next shot the game is visible on the screen before disappearing again in the shot afterwards. Additionally, the video game shown is Halo 3, which is only available on Xbox 360. When Miguel 'closes' the game, he is actually alt-tabbing from a "TWVidpla" window to "Plaindesktop.bmp," and a laptop battery indicator is visible. (00:12:55)
Continuity mistake: When Shanda is sat on Debra's desk, her handbag keeps moving from on her lap to at her side between shots.
Continuity mistake: When Dexter wakes up in front of Rita's house, he has a sweat patch on his shirt. When he gets into his car a minute later, it's gone.
The Lion Sleeps Tonight - S3-E3
Continuity mistake: A man in a blue t-shirt and holding two beer cups is seen walking in front across Dexter and Miguel. In the next shot the same man is seen walking behind them. (00:15:40)
The Big One - S5-E12
Continuity mistake: When Dex gets the phone-call from the city archives he steals a red Pontiac Grand Am GT. When he crashes it at the camp it's a badly-painted orange Chevrolet. (00:21:00 - 00:28:00)
Suggested correction: The car is a red Pontiac but it is a Grand Prix, not a Grand Am.
Continuity mistake: Quinn brings Deb into the interrogation room and puts his coffee cup down about 6-8 inches from the end of the table. He then moves his chair and begins to talk to Deb without touching the coffee. In the next several shots the cup has moved to the middle of the desk, and the amount of steam rising from the cup keeps increasing as it sits there.
Scar Tissue - S8-E4
Continuity mistake: When Debra is talking to Jacob Elway, a piece of salad appears on her fork and disappears the next second. (00:31:55)
Continuity mistake: When Dex stabs Lila, the knife goes in near her stomach, where her vest starts. But in the close up shot, the knife is higher up in her, in her chest. (00:48:45)
Continuity mistake: When Dexter and Deb are celebrating her promotion, just before they toast and you look at them from the side Deb has her hands free, when the camera changes she has a crab leg in her hand, and when the camera changes again her hands are empty once more. (00:46:45)
Continuity mistake: Dexter browses the book shelf at Travis' house. The camera pans across, revealing a book titled "Apocalypse Bound" situated at the right on the shelf. When Dexter takes the book off the shelf, it is then shown as the fourth book from the left. When he puts it back, the empty gap where it used to be now appears to the far right on the shelf. (00:25:50)
Continuity mistake: In Season 6, Episode 10, Dexter and Harry are in the motel room where Travis was staying (timestamp 1). Dexter decides to post on Gellar's blog (impersonating Gellar), and the screen on the computer shows the post date as Sunday, November 24, preceded by a Sunday, November 20 post. Aren't Sundays supposed to be a week apart? Then in episode 12 (timestamp 2), Travis is in Dexter's apartment and sees the poster for the Noah's Ark school play. The date posted for the play is Saturday, October 8, ie. in the past compared to the earlier episode. Plus If November 24 were on a Sunday, then October 8 should have been on a Tuesday. (00:09:20 - 00:30:20)
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.
Continuity mistake: When Rita is talking to Bob outside the house, she is carrying a box. A piece of tinsel keeps moving from hanging over the edge of the box, to being tucked inside.
Continuity mistake: When Rudy has Debra in a headlock on the yacht, his left hand continuously moves between shots from on her head to gesturing in the air.
Continuity mistake: In Paris, when Dexter grabs the knife off the table in the close-up, he's wearing the black glove on his right hand, but it cuts to the wide shot and both of Dexter's hands are bare; then in the next shot the black gloves reappear. It's rather odd that the actor was even filmed without wearing his gloves in the wide shot.
