* CastTheExpert: For the orgy scenes, a professional New Zealand company that specialises in sexual gatherings was hired. They were told to do whatever they wanted on camera, and anything that was too much for the network would be edited.
* {{Corpsing}}: The infamous BedTrick scene in the episode "Whore" took twelve hours to film, not helped by the fact that Andy Whitfield and [[spoiler: Viva Bianca]] kept bursting into hysterical laughter while their characters were having sex.
* DyeingForYourArt: The actors playing the gladiators had a strict boot camp and diet to ensure their physiques. The women had a strict diet and workout too, but obviously not the extent of the gladiator one. Liam [=McIntyre=] came onto the series severely underweight from another role, and had to bulk up.
* 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 Creator/JohnHannah plays an Italian.
** Kiwis Creator/LucyLawless, Craig Parker, Creator/VivaBianca and Anna Hutchison all play Italians.
** American Erin Cummings plays a Thracian.
** American (of Italian-Asian descent) Katrina Law plays a Hispanic.
** Half-Maori Creator/ManuBennett plays a Gaul.
** Australian Dan Feuerriegel plays a German.
** Maori Pana Hema-Taylor plays a Syrian.
** 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.
** East Indian Lesley Ann Brandt and African/English Cynthia Addai Robinson play a Phoenician
* FakeBrit: Combining most of the above with TheQueensLatin results in this trope.
* 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 who decided not to renew her contract with STARZ due to money issues.
* PlayingAgainstType: To most American tropers, John Hannah. Widely known as bumbling brother Jonathan in the ''[[Film/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.
* PromotedFanboy: Liam [=McIntyre=] had been a huge fan of the show.
* 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.
* ThoseTwoActors:
** Craig Parker (Glaber) and Lesley Ann Brandt (the first Naevia) previously starred together in the New Zealand sitcom ''Series/DiplomaticImmunity''.
** Viva Bianca (Illythia) and Hanna Mangan Lawrence (Seppia) both starred in the movie ''X: Night of Vengeance''.
** Cynthia Addai Robinson (the second Naevia) and Nick Taraby (Ashur) were both in ''Film/StarTrekIntoDarkness''.
* 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.
** Agron was planned to die in the ludus massacre instead of [[spoiler: Duro]], but producers realised it would have more emotional impact if it was the latter. This is hilarious considering [[spoiler: Agron is one of the few characters to survive the series]].
** A movie was planned, taking place between ''Vengeance'' and ''War of the Damned'', but producers realised too much would have to be censored to get an NC-17 rating in the US.
** Stephen Amell was one of those considered to replace Andy Whitfield as Spartacus. A lot of the cast of this would later appear on Amell's own ''{{Series/Arrow}}''. ''Series/PrisonBreak'' alumns Creator/WentworthMiller and Creator/DominicPurcell were also considered.
** Lucretia was supposed to have died in the Season 1 finale along with everyone else. However Lucy Lawless proved popular on set and producers loved her performance so much, she was brought back for Season 2. According to Viva Bianca, Illythia was meant to die in the ludus massacre too - but when Andy Whitfield was diagnosed with cancer and Lesley Ann Brandt chose not to renew her contract, Steven S [=DeKnight=] wanted to keep as many familiar faces around to help viewers with the transition.
** Barca was written to be Oenomaeus originally and the brotherly bond with Crixus was intended for him. However Antonio Te Maoiha was only available for six episodes. So they rewrote the character to be Barca, and then had Doctore revealed to be Oenomaeus.
** Steven S [=DeKnight=] had stories planned to go a few more years, but the network decided to end after Season 3. They told him in advance, so he could wrap up the story.
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