Continuity mistake: When the debt collector is talking to the man in the park eating area, there is a cup on the table in front of them with a straw sticking up, but leaning to one side. Each time the camera cuts to a different angle and even coming back to the same angles, the straw is always changing positions pointing in different directions. (00:19:36)
Factual error: At an eating area, a collector shows a man a computer screen with his daughter in real time and has her call him. She then speaks in the phone and you can see her lips and actions lining up perfectly with the words he is hearing. It would not be this perfectly in sink even in the most optimal of conditions. There is a slight delay between the video from the camera and sending that to the computer being shown. And then there is also a slight delay of the phone single traveling through one phone to the other. These would not line up right and so the father would not see the lips moving exactly with what he hears his daughter saying over the phone.
Continuity mistake: Karen is talking to Urich in a diner as he is drinking from a mug. As she is saying there has to be a trail, the camera is behind Urich and pointing at him fiddling with his cup. In this shot, he places his thumb over the rim of the cup down inside it. Then in the next shot from over Karen's shoulder, suddenly he is just holding the cup normally. (00:12:24)
Continuity mistake: After Matt and Claire kiss, she says she wondered when he would do that. In that shot, he has both of his hands up on her shoulders, and she is holding one of her own hands against her chest. It then cuts to a side view and now only he has one hand on her, further down her arm and her hand is down. (00:05:07)
Continuity mistake: At the art gallery, after Matt tells Fisk that he's aware of his work as well, Vanessa tells Fisk that Matt is looking to buy some art. Fisk is looking directly at Matt in the first shot, but in the next he has his head turned to look at Vanessa. (00:23:44)
Revealing mistake: When Matt is running across the rooftops doing Parkour to keep up with the car he's following, there is a shot of him running towards another roof about to jump. In this shot, it's clear there is a stunt double in Charlie Cox's place. (00:29:27)