Just before Castle calls Wes Craven, the clock in front of him, shows 3:12, when he hangs up - about two minutes later - it still shows 3:12.
When Castle and Beckett visits Leopold Malloy, he knew Beckett to be "Detective Beckett" even though they never introduced themselves.
Leopold Malloy speaks of his appeal. Malloy was found not guilty by reason of insanity. He has nothing to appeal.