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: 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)
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.