Trivia: Across the hall from Nelson and Murdock is an office that reads "Atlas Investments", a nod to the comic company (Atlas Comics) that would later become Marvel. The logo is the same as that of Atlas Comics too.
Trivia: The black suit and the mask worn by Matt is a replica of the Daredevil costume from The Trial of the Incredible Hulk (1989) and the 1993 "The Man Without Fear" origin comics by Frank Miller and John Romita, Jr.
Trivia: During their dinner, Vanessa mentions a prince in a white suit and an ascot, to which Fisk replies, "it's a bit much." In the comics Fisk has been drawn almost exclusively in a white suit and ascot.
Trivia: Wilson Fisk's code-name of Kingpin isn't acquired until season 2. However, his eventual nom de guerre is foreshadowed in season 1 by the way of Ben Urich's cork-board in his office, which features a king of diamonds playing card pinned to it.
Trivia: When Daredevil and Frank are talking in the cemetery, some people thought Charlie Cox was crying when Frank was telling the story about his children. It turns out that Cox was just sweating profusely under his mask from multiple takes of carrying Jon Bernthal up the hill, with some of the sweat trickling down near his eyes.
A Cold Day in Hell's Kitchen - S2-E13
Trivia: In Karen's office there are some frames on the wall, one of them has the title The Battle of New York, referring to the Avengers fighting Loki and the Chitauri army.
Trivia: In Dex's flashback as an adolescent playing baseball, he has Bullseye's symbol and colours on his cap.
Trivia: The Dogs of Hell motor bike gang can also be seen in Agents of Shield.
Trivia: The dogs of hell gang also appeared in the Agents of SHIELD TV show.
Trivia: While Matt is practicing in the gym, the camera focuses on an old poster advertising a match between his father and Carl "Crusher" Creel. Creel is the Marvel villain the Absorbing Man, who has also been seen in Agents of SHIELD. (00:48:35)
Trivia: Daredevil is chained by Frank Castle in a similar way from The Punisher: welcome back Frank #3.
Chosen answer: After some research, I can say that no, Cass is not a character of Marvel, nor is he present in the Netflix show. As far as I can tell, it's either a real person, or a random name chosen for the coffin, most likely the former. In another season of Daredevil, the show utilized a real cemetery displaying real names in the tombstones.