Because of it being the first major science-fiction miniseries since 'Steven Spielberg''s Taken, and because of its nearly opposite premise, it is jokingly renamed by sci-fans as "Put Back".
The opening scene played at the beginning of each episode, which explains the premise of the series, is 44 seconds long.
When the producers were conceiving of the series, the secret of who had abducted the 4400 was supposed to be revealed in the fifth season. USA had picked the show up as a miniseries and wanted it to have some resolution, so the secret was revealed in the fifth episode.
The address of The 4400 Center, 6265 Crescent Road, is the same as The Chan Centre for the Performing Arts, University of British Columbia, Vancouver. The Chan Centre was the filming location for the exteriors and some interiors (including the main lobby) of The 4400 Center.
For advertising the show, stock images were purchased from various stock image agencies to create a variety of people to show as part of the 4400 missing people. This was most likely to avoid paying various actors to use their image for the advertisement purpose.
SPOILER: Toward the end of the series, several regular characters are seen developing their 4400 abilities during a mostly dialogue-free musical montage. Because this happens mostly in silence, there was some confusion among viewers about exactly what those powers entailed, so the show creators cleared up some of that confusion on the DVD extras. For instance, Meghan's power, which first manifests itself when she turns a pen into a flower, is, more broadly, turning inorganic material into organic material; despite some confusing camerawork that implies otherwise, Jed's power is not to make another person look like himself but rather that now he has a fully-formed extra copy of himself; and Marco's power is teleportation to any location he looks at in a picture.
SPOILER: On the DVD extras, the showrunners admit that they never planned to give Jordan Collier a name with the same initials as Jesus Christ. The character's name was originally going to be Jordan Garfield, but that name failed to pass the legal clearance procedure that all Hollywood scripts must undergo, and so the last name "Collier" was a last-minute replacement just because it did pass legal scrutiny.
This long episode is sometimes split into two when aired by a TV company.
Jeffrey Combs, who plays Kevin Burkoff in 4400, gives Tess a book while they're in the mental institution by H.P. Lovecraft. In the movie Necronomicon, he plays H.P. Lovecraft.
Besides playing H.P. Lovecraft as stated above, Jeffrey Combs has starred in several films based on Lovecraft's work, namely Re-Animator (1985) and its sequels.
In a closing scene of the Season 2 Finale, "Mommy's Bosses," Dr. Kevin Burkhoff, played by Jeffrey Combs is shown preparing to inject himself with a dose of "promycin," appearing as a fluorescent yellow/green serum. This echoes a scene from Re-Animator (1985), where Herbert West, also played by Jeffrey Combs, is caught injecting himself with a similar-looking substance to keep his "mind sharp."
This episode's third murder victim is named "Holly Martins". Holly Martins (Joseph Cotten) is the protagonist of Carol Reed's "The Third Man".
At the end, when Collier is expanding the perimeter of Promise City, the video feed is labeled "Camera 4x07", the number of the episode.
Meghan mentions that she had attended a performance of Tom Stoppard's 1993 play "Arcadia." "Arcadia," like The 4400 has a main character who is a precocious and intellectually brilliant little girl at the beginning and then abruptly grows into adulthood by the end. Both the plots of "Arcadia" and "The 4400" also concern skipping between different time periods in history, and a group of people in the future trying to gain insights into the past.
During Jordan's inspirational speech on the steps toward the end of the episode, writer and executive producer Ira Steven Behr is one of the extras in the crowd. He can be seen clearly toward the front of the crowd in at least one shot, and is easily recognizable because of his distinctive mustache and goatee, which are dyed blue.