When Luke Cage visits Jessica at her apartment, he is wearing the same suit and tie he wears in They Reminisce Over You (2018).
At 48:23 during Kilgrave's voiceover, Jessica's face is illuminated by a purple glow - purple being Kilgrave's signature color - and there were a few other purple things in the scene leading up to it, like a person's coat, a schedule, and Jess' ticket.
As of this episode, Krysten Ritter is tied with Charlie Cox for the second most appearances in the Marvel Netflix Universe, with 47 episodes. Deborah Ann Woll, who played Karen Page, has the highest episode appearance count of 48 episodes.
This is the series finale.
The courthouse Jessica is shown walking out of at the beginning of the show is located at 60 Centre Street. Although this courthouse and it's distinctive stairs are frequently shown in television and movies as being the NY criminal courthouse, in actuality Manhattan criminal cases are primarily held in the far less picturesque 100 Centre St.