When Elektra, Mark Miller and Abby arrive at McCabes ranch house and go inside, McCabe is standing there, looking at the hawk on the fencepost; you can see quite blatantly the anklets around the hawks legs and rope connected to the holding the hawk in place.
When Elektra is talking to Mark after she finds out he and his daughter are not who they say they are, she says, "Who are you? Don't lie to me." When she says "Don't lie to me," her lips are not moving.
During one flashback, Elektra goes back to her ride in the ambulance when she dies. The paramedics use a defibrillator on her. A defibrillator is only supposed to be used on bare skin but they have it being used over a leather vest. (This was most likely done to help connect the flashback to her final scene in Daredevil by showing the costume she wore that night.)