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)
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)
See-Through - S2-E4
Visible crew/equipment: When the wife of one of the victims invites Angel in, the silhouette of a camera man is reflected in the door when she closes it.
See-Through - S2-E4
Visible crew/equipment: As the camera pans to Dexter just before he jumps over the fence at the police station, the shadow of a boom mike is visible on the white wall.
That Night, A Forest Grew - S2-E7
Continuity mistake: When Deb meets Lila, Lila is at the fridge and puts her arm over her breast - she isn't wearing the 'engagement' ring. However when she returns to Dexter's room it's on her finger.
That Night, A Forest Grew - S2-E7
Continuity mistake: The door on his fridge keep changing. When she says "pardon my tits" it is hinged on the right, other episodes it is hinged on the left.
Suggested correction: Hinges on fridge doors can be swapped around for ease of the user.
But virtually nobody casually re-hangs their fridge doors on a whim - they set them up once and leave them. This is clearly done for the sake of visual contrivance.
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.
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.
There's Something About Harry - S2-E10
Continuity mistake: When Angel is drinking with Lila after finishing her apartment, the wine glass changes position throughout the scene.
Continuity mistake: When Doakes is carrying the packs of cocaine out of the cabin, the position of his arms and the cocaine varies wildly from shot to shot. Notable examples are that the cocaine goes from being arranged in neat, accurate stacks, to being haphazardly and irregularly stacked, and back to neat again. His grip on the cocaine also varies a lot; he starts out with straight arms, then suddenly has a 90-degree bend at the elbows, and back to straight again, all depending om camera angle. All of these changes happen too fast to have been natural, and Doakes is on camera the whole time.
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.