Harold Finch's (portrayed by Michael Emerson) fiancee, Grace Hendricks (recurring, seasons 1-3,5) is portrayed by Michael Emerson's real-life wife, Carrie Preston.
Of the 103 episodes in this show's run, 71 have a rating of over 9.0, as voted by IMDb users [October 2016]
The character of Sameen Shaw was introduced on the show with the potential of becoming a regular, but it only happened because she was well received by the audience and the producers were happy with Sarah Shahi's performance.
For Season 4, the beginning of Michael Emerson's opening voice-over is changed from "You are being watched. ..." to "We are being watched. ..."
The opening sequence contains one or two scenes from the current episode, always at the point Finch says, "...victim or perpetrator, if your number's up, we'll find you."