[4] James Spader, Diego Klattenhoff, Hisham Tawfiq, and Harry Lennix returned for the season, while Anya Banerjee debuted in a new main role.

[6] On February 22, 2022, James Spader announced the renewal of the series while making his appearance on The Tonight Show Starring Jimmy Fallon, with the NBC press release coming out shortly after.

[2] James Spader later revealed that the season was planned as final before the filming so as to finish the series properly.

[30] On May 27, 2022, it was revealed that original cast member Amir Arison and another main actress, Laura Sohn, would depart the series following the finale of season 9.

[41] On November 23, Chris McKenna wrote that he would be joining the series in an unknown recurring role, later revealed as one of Wujing's contract associates.

[44] On October 6, filming for the 4th episode in the season, which is also 200th overall, was finished and celebrated with a special event at their set in Chelsea Piers, in which the Task Force headquarters are located.

[48] While announcing the renewal of the series in February 2022, Spader noted that a 22-episode season is expected to be produced,[28] which was later confirmed by TVLine on November 18, 2022.