Yes, there were lots of little bits and pieces here and there that are not dwelt on, but just enhance the show.
Like, when Heather is "assessing" Karen and Karen starts effectively pushing some buttons there is a quick shot of Muse in the mirrored window of the interrogation room. Not quite blink and you miss it, but in the background enough that it you are not looking for it you will not see it. Not necessary to make or break the scene, but just a little extra enhancement in post-production (I assume) to show the state of mind of the characters.
Related to that, I am not a Daredevil comic reader and have not seen the original show. What was Heather on about with Karen killing her brother? I know she did kill someone (came up in previous dialogue between her and Matt when talking about Bullseye), but I did not get the impression it was a family member.
Cheers