Continuity mistake: (Episode 4: Lonely hearts) The woman's body changes position after being hit by the car in the beginning. As the body stops tumbling after the hit, she ends up laying next to the bridge railing, along side it, in the next shot her body lays in the middle of the driving lane, feet toward the mid-line and head towards the railing.
Continuity mistake: When Juliette comes back from being in a coma, it is made to seem like they only have 1 bedroom upstairs as Nick stays on the sofa for a while before moving in with Monroe. However, later in the series, when Trubel comes in, she stays in their guest bedroom.
Continuity mistake: When the woman falls near the beginning, her arms are out to her side, almost making a T shape, even after she stops moving. In the next shot, her arms are down by her side.
Continuity mistake: When the couple is in the boat when the creature appears, the woman is taking a picture and holding her phone in her left hand, she turns around and her left hand is raised and her right hand is on the boat edge. When the camera angle changes, her left hand is now on the boat and her right hand is lowered and holding the phone (confirmed when the camera angle changes again and she's in the same position, holding the phone in her right hand).
Continuity mistake: When Marwan Hanano stops the basketball with his foot, his feet are facing the court, so his left foot is almost perpendicular to the concrete strip. In the next shot, with his right foot still on the ball, his left foot changes position, so it's nearly parallel with the concrete strip.
Continuity mistake: When Monroe plays back the video of Wu, Wu tilts his head over after he drops his hand. However, in the original scene Wu never moves his head. (00:36:35 - 00:37:55)
Continuity mistake: When Nick goes to see Juliette/Eve, she's in a coma and unable to move and her hand and fingers are lying flat against her belly. In the wide shot of her, her hand is turned and her fingers are somewhat on top of each other, instead of lying flat. It goes back to lying flat in the next shot of her.