When the detectives are discussing the explosion in the Chinese restaurant at the crime scene, Knight tells Scarfe that it was an "outside-in" job, and Scarfe agrees that if the explosion had "been on the inside", there would be debris in the street. However, the rocket was shot into the restaurant, and the scene showing the explosion clearly shows it originating from the inside of the restaurant.
When Inspector Scarfe calls Zip, you can clearly see the start screen of Samsung and how it goes to screen saver mode. Clearly he isn't actually calling anyone.
When Luke is punching the wall in his cell, you can see it bounce with every hit.
In the prison cell scene where we see Luke Cage attacked by Shades, and another goon; just after Shades is dropped to the floor and Luke sandwiches Shades in between the cell gate, we can clearly see that the other goon is actually a stunt double (the double has longer hair, also darker skin tone). Seconds later both Shades and goon are tossed out of Luke's cell, and the goon now has his original form with shorter almost bald hair style.
When Luke is bench-pressing, the weights are obviously props.