* In one episode, a plaintiff in a courtroom is suing one of TheGreys because his ancestor was abducted by the alien's ancestor, a ShoutOut to the modern day abductee phenomenon.
* WordOfGod is that the Canticle reference was not intentional. He had been doing research on monasteries for another project, and so had them in mind when he was writing the episode. It wasn't until later that he realized he'd pretty much done ''Literature/ACanticleForLeibowitz'', but he couldn't think of another way to do the scene that worked as well, so he kept it as is.
* Such as a Martian representative named Amanda [[JohnCarterOfMars Carter]] in the episode ''Spider in the Web''. With an ancestor named John, [[{{Anvilicious}} in case you didn't get it]].
* The Psi Corps was a WholePlotReference of sorts; the true ShoutOut was naming the head psicop Alfred Bester.
* Multiple Shout Outs to George Orwell's ''1984'': Ministry of Peace, rewriting the dictionaries, etc.
* The episode ''Passing Through Gethsemane'' has a Biblical shout out in its title, and a plot based on Creator/HPLovecraft's [[spoiler:''The Case of Charles Dexter Ward'' -- right down to naming one of the characters Charlie Dexter.]]
* Much of the philosophy spouted by various races is only slightly re-worded from human thinkers. For instance, much of Minbari philosophy is a reworking of things CarlSagan said. His "Star Stuff" speech from the ''Cosmos'' special is repeated almost verbatim by Delenn in the pilot. Given that modern Minbari philosophy and religion was essentially created ''en masse'' by [[spoiler:a time-traveling Sinclair in his guise as Valen, it may be that Sinclair directly cribbed from Sagan]].
* The greatest ShoutOut in the series finale: [[spoiler:And now, for [[KeepCirculatingTheTapes those of you who have been archiving]] this [[ShowWithinAShow ISN Special Documentary]], the people responsible...]]
* In "Infection", a character trying to get Franklin's attention mentions that there's a [[Literature/TheWarOfTheWorlds Martian death machine parked outside the station, and they'd like to have a word with him about the common cold.]]
* JMS was very touchy on the subject of {{Shout Out}}s. He stated that freelance writers got carried away with them in the first season, and he put a halt on them after that. He also claimed that much of what fans called shout outs were either unintentional, non-existent, or a result of both parties having drawn from the same, far older, sources. There was one particular instance in Usenet where he went off on a long rant about this after someone asked if he was referencing ReturnToZork in an episode.
* Draal in "The Long, Twilight Struggle" plays up a very Oz-like attitude, right up to proclaiming "great and terrible".
* [[spoiler:President Clark's final actions are a mirror of Hitler's final plans right down to the Scorched Earth decree. Of course, Hitler issued his decree to generals and factory managers who immediately ignored it, Clark issued his to automated orbital death rays that had to be taken out by the attack fleet. Then he shoots himself before he can be humiliated by his enemies in public.]]
* The last thing Bester does at the end of his first appearance in "Mind War" is turn to Commander Sinclair, [[Series/ThePrisoner hook his forefinger and thumb into a circle, raise his hand to his forehead in a salute, and say, "Be seeing you."]]
* In "The Face of the Enemy", when William Edgars tells Garibaldi that by betraying Sheridan he has brought him closer to the truth. Garibaldi responds by saying "The last guy got [[Literature/TheBible thirty pieces of silver for the same job.]]"
* Vir's conversation with the technomage in "The Geometry of Shadows" includes two: The technomage's name is [[TheElricSaga Elric]], and he quotes "an old saying" about not trying the patience of wizards that originates in ''Literature/TheLordOfTheRings''.
* Earthforce ''Omega''-class destroyers, and in particular the rotating section, are similar to the ''Leonov'' from ''Film/TwoThousandTenTheYearWeMakeContact''
* In "Voices of Authority", Ivanova comments to Sheridan about the woman in his quarters trying to seduce him, "Good luck, Captain. I think you're about to go where... ''everyone'' has gone before." referencing ''Franchise/StarTrek'''s "To boldly go where no man has gone before."