* FakeNationality: Nobody is from any of the areas of the Roman Republic where their characters would have originated:
** Welsh-Australian Creator/AndyWhitfield and Australian Liam [=McIntyre=] play a Thracian, who inhabited south-eastern Europe, beyond the borders of AncientGreece.
** Scottish John Hannah plays an Italian.
** Kiwis Creator/LucyLawless, Craig Parker, Viva Bianca and Anna Hutchison all play Italians.
** American Erin Cummings plays a Thracian.
** American Katrina Law plays a Hispanic.
** Half-Maori Creator/ManuBennett plays a Gaul.
** Australian Dan Feuerriegel plays a German.
** Maori Antonio Te Maioha plays a Carthaginian.
** American Nick Tarabay (of Lebanese descent) plays a Syrian.
** Australian Dustin Clare plays a Celt.
** English Simon Merells plays an Italian.
* FakeBrit: Combining most of the above with TheQueensLatin results in this trope.
* HeyItsThatGuy:
** Lovable coward [[TheMummyTrilogy Jonathan]] and {{Xena|WarriorPrincess}} are married!
** This show shares [[http://itsmorganabitch.livejournal.com/7155.html practically half of its cast]] with ''Series/LegendOfTheSeeker.''
** Oenomaus is the Persian messenger from ''[[Film/ThreeHundred 300]]''. Although [[CastingGag this time]] ''he'' gets to kick the ''protagonist'' down a well.
*** Not to mention that he, once again, declares something to be madness.
** Jaime Murray, from ''Series/{{Hustle}}'', ''Series/{{Dexter}}'' and ''Series/{{Warehouse 13}}''.
** No wonder Oenomaus feels like he's got big shoes to fill: he's taking over as Doctore from [[AttackOfTheClones Jango Fett]].
** Creator/ManuBennett (Crixus) was Marc Antony in an episode of ''Series/XenaWarriorPrincess''. Sure enough, he and Xena have an affair.
** Viva Bianca (Ilithyia) and Hanna Mangan Lawrence (Seppia) costarred in the 2011 movie ''X''.
** [[Series/PowerRangersRPM Eka Darville]] (Pietros) and [[Series/PowerRangersJungleFury Anna Hutchison]] (Laeta) are both Franchise/PowerRangers alumnae.
** Glaber is [[Film.TheLordOfTheRings Haldir of Lothlórien]]!
** Laeta [[spoiler: didn't survive]] a trip to a [[Film/TheCabinInTheWoods cabin in the woods]]!
** Lucretia was/will be a [[Series/BattlestarGalacticaReimagined Cylon]]!
* HeyItsThatVoice: In the Japanese dub:
** [[Creator/RikiyaKoyama Spartacus is]] [[Manga/{{Naruto}} Yamato]], [[Series/TwentyFour Jack Bauer in Japanese]] and [[VideoGame/MetroidOtherM Adam Malkovich]]
** [[Creator/AtsukoTanaka Lucretia is]] [[GhostInTheShell Motoko Kusanagi]], [[QueensBlade Claudette]] and [[Manga/{{Naruto}} Konan]].
** [[Creator/ReiIgarashi Sura is]] [[MagicalGirlLyricalNanoha Precia Testarossa]].
** [[Creator/KenjiNomura Doctore Oenomaus is]] [[VideoGame/BlazBlue Iron Tager]] and [[Manga/{{Bleach}} Yammy]]. And just like his original actor, he also voiced [[Film/ThreeHundred The Persian Messenger too in Japanese]].
* TheOtherDarrin: As of the second season, Liam [=McIntyre=] will be replacing Creator/AndyWhitfield as Spartacus, while Cynthia Addai-Robinson will be replacing Lesley-Ann Brandt as Naevia due to Brandt's preoccupation with [[CSINewYork CSI:NY.]]
* PlayingAgainstType: To most American tropers, John Hannah. Widely known as bumbling brother Jonathan in the ''[[TheMummyTrilogy Mummy]]'' movies, he shows a very dark side in the fifth episode. To a lesser extent, Creator/LucyLawless as his conniving wife. The two actors enjoyed playing against type so much that they both came back to reprise their characters for the upcoming prequel mini-series.
* ShortLivedBigImpact: The late Creator/AndyWhitfield is pretty much considered the star of the show by pretty much everyone despite only appearing in the inaugural season (two if you count flashback cameos in the prequel). Even [[TheOtherDarrin Liam McIntyre]] outright stated upon being cast that he hated the fact that [[TakeThatMe he had]] [[HumbleHero to replace him]].
* SpellMyNameWithAnS: Many fans don't seem to know how to spell Ilithyia's name correctly.
* WhatCouldHaveBeen:
** Varro was supposed to die in "Mark of the Brotherhood", but Jai Courtney's friendship and chemistry with Andy Whitfield led to his death being pushed back.
** In "Revelations", Solonius was meant to try to flee from Spartacus and die a coward, but the writers changed their minds due to the actor's good work and impressive physique, leading to Solonius fighting back and dying a warrior's death.
** During Titus Batiatus' death scene, his son Quintus Batiatus was meant to be present. With his dying breath, Titus would request Oenomaus be freed. Quintus would then decide not to honor this last request.
** In "Libertus", when the rebels infiltrate the arena to bring it down, it was planned that Tullius' corpse be found at one point, OR Tullius would have somehow survived, but gone mad and be eating rats in the depths of the arena. Also, the spear that killed Cossutius was meant to have gone into his mouth and out the back of his head, as a fitting KarmicDeath for a rapist.
** The penultimate episode, ''The Dead and the Dying'', was originally meant to be closer to the historical event in which Spartacus would have captured several Romans and forced them to fight each other in gladiatorial combat to honor Crixus, which would culminate in a battle between Ceasar and Tiberius. The writers decided that they couldn't have the second to last episode be nothing but the protagonists sitting down watching other people fight, so it was rewritten so that Spartacus, Gannicus, and the others fought the Romans themselves.
** Mira was originally going to survive "Wrath of the Gods", and would have eventually become Gannicus' lover.
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