Babylon 5 (1994)

Continuity: Before she's succeeded in her effort to move it with telekinesis, Talia's penny reverses itself on the table between takes, changing from tails-up to heads-up.

Revealing: When he's attacked in Down Below, Dr. Franklin is shoved against a station bulkhead/wall that wobbles when he hits it.

Deliberate "mistake": Though he moved freely about the station in his environmental suit, Kosh was never actually seen going through a door. He approached doors, but then, sometimes rather disconcertingly, would suddenly be shown on the other side. The reason: look closely and you'll realise his costume was too large to fit through any of the doorways on the set, so in reality the character would never have been able to move around the station.

Walter Koenig's recurring Psi Corps character, Bester, was named in honor of science fiction writer Alfred Bester, who coined the term "psi cop" in one of his many novels about psychic manipulation.

Marcus tells the Mars resistance fighters that he was raised on the planet Arisia. J. Michael Straczynski used that name as an homage to one of his favorite science fiction book series, E.E. "Doc" Smith's Lensmen novels, in which the Arisians were the good guys.

Straczynski planned out Babylon 5's entire story arc from the beginning. He kept a written copy of it on a 200-page encrypted computer file. Straczynski never revealed his full plans to his writing team until the very end of the series. He intentionally included red herrings in the plot so that viewers would not be able to predict the outcome of the series.