During the fight with Melvin Potter, circular saw blades, a poster and the symbol from his original costume reference him being the sometime Daredevil comic villain The Gladiator. He also mentions 'Betsy' who in the comics was his therapist.
The only episode in season one where all 9 main characters appear.
During his talk with Matt, Father Lanton mentions "Fall from Grace." This is the title of a story arc during the original comics of the 90's where Daredevil gains his short-lived armoured costume.