Jonathan Frakes directed three episodes of this series - he also directed 2 of the 3 movies this series is based on.

King Elendils helmet from "The Lord of the Rings: The Fellowship of the Ring" appears on a stand in the main room of The Library.

While being an action adventure comedy weekly series, each week is said to (also) have its own genre mixed in. Including horror, fairy tales and time travel.

Spin-off from the original "The Librarian" movie series starring Noah Wyle.

Jake Stone is an expert Art Historian. Christian Kane majored in Art History in college.

In Season 1 Episode 4 And Santa's Midnight Run, the cargo plane they fly to Alaska has (C-XM45) written on it which could be translated to Christmas.

Jerry O'Connell making a guest appearance in an episode about alternate universes is appropriate after his show Sliders. Jerry O'Connell is married to Rebecca Romjin.

This is not Christian Kane's first spin-off show centering around a supernatural theme. He also co-starred in the Buffy the Vampire Slayer (1997) spin-off Angel (1999).

Christian Kane plays Rebecca Romijn's brother in the TV series King & Maxwell (2013).

That show's ratings were down in its fourth year, but the news of its cancellation in March 2018 still came as somewhat of a surprise. The Librarians has a very dedicated fanbase that keeps the show trending on Twitter, and its ratings were still okay for a cable series. But the network was going through a period of rebranding, and apparently they decided the veteran show did not fit in as well with their new look (The Last Ship is also rumored to be on the chopping block after its upcoming fifth season). Producer Dean Devlin indicated that he will be shopping the show to other venues, and now is the time for fans to support it on the social networks.

The Librarians TV series is from the producers of the Leverage (2008) TV series and The Librarian movie trilogy.

On March 9, 2018 it was announced The Librarians would not be coming back for a fifth season. But the producers were shopping it around to other networks.

Lindy Booth and Matt Frewer both star in The Librarians (2014) and Dawn of the Dead (2004).

John Larroquette and Rene Auberjonois previously worked together on Boston Legal (2007-2008).

Christian Kane and guest star Lea Zawada, who played Katie Bender in episode 8, have previously worked together in the TV show Leverage on the episode titled The Carnival Job.

Several (main) actors previously worked together on the TV series Leverage and King & Maxwell.

Johnathon Frakes, who has directed three episodes and two of the three movies surrounding this series, also directed 13 episodes of the television show Leverage, where Christian Kane started as The Hitter, Eliot Spencer.

Jeff Fahey, who plays Isaac Stone in season two , played Jobe Smith in Lawnmower Man. Matt Frewer, who plays Dulaque in season one, also played Jobe Smith in Lawnmower Man 2.

The name Dulaque "Matt Frewer" is in fact a pseudonym for "Lancelot Du Lac". As pointed out by Jenkins when he said "So that's what he's calling himself now". Jenkins is in fact Galahad, the son of Lancelot Du Lac.

"Jenkins", John Laroquette's character, is in fact "Galahad", one of the Knights of the Round Table, as revealed by Morgan le Fey in the "And The Rule Of Three" episode.

Rebecca Romijn's real-life husband Jerry O'Connell played the younger Dulaque/Lancelot in the Season One Finale.

Warehouse 13 would be a comparison to The Librarians library as both are holding artifacts by magic and technology from around the world & throughout time. One can argue The Librarians movies came out before Warehouse 13, yet the group dynamic of The Librarians is based more like Warehouse 13.