After Jeri's phone call with Wendy, Kilgrave knocked on the window of his sound-proofed cell and was heard by Jeri. A sound-proofed environment will not allow that.
The video of Kilgrave from 1985 refers to a rugby union player being sent to the sin bin. This is a key plot point. Sin bins weren't introduced in Rugby Union until 1995. Cards were introduced to Rugby League in 1976, but were removed between 1981 and 1987.
When Jessica enters Kilgrave's cell, when she closes the door, she turns the wheel in the direction marked "open".