Resurrection - S3-E1
Continuity mistake: When Matt is recovering in the orphanage, his bandages around his torso keep changing position. They go from just barely below his nipples, to covering them completely, to way below them in the same scene.
Seven Minutes in Heaven - S2-E9
Continuity mistake: After Frank stabs Dutton in his jail cell and Dutton falls to the floor, Frank's white prison uniform is clean, but when Frank exits the jail cell there is blood on the collar of his uniform. (00:40:05)
Continuity mistake: When Frank Castle walks up to Murdock, the chains are wrapped around his torso, two over his chest and three over his abdomen, but when the shot cuts, it's one over his chest and four over his abdomen. (00:17:40)
A Cold Day in Hell's Kitchen - S2-E13
Continuity mistake: Before the last fight there are over 30 ninjas waiting for Daredevil and Elektra. Elektra kills like 5 or 6 of them and Matt struggles just with Nobu, but when the fight is over the rest of the ninjas are dead below the water tank.
Seven Minutes in Heaven - S2-E9
Continuity mistake: The wound on Fisk's right cheek changes length and position during the whole chapter.
Continuity mistake: While Matt and Karen are talking outside of the courthouse, the sun changes between shots.
Continuity mistake: When Nobu drags Matt across the floor, he leaves a massive trail of blood, but in the wide shot of Matt, the trail is gone. (00:48:30)
Continuity mistake: The bruises on Castle's face are dark then faded and then dark again.