Other mistake: In the scene where Barca is bleeding at the pool, Batiatus comes and grabs his hair. Barca abruptly moves before Batiatus starts to actually pull his hair.
Spartacus: Blood and Sand (2010)
1 other mistake in season 1 - chronological order
Starring: Lucy Lawless, Manu Bennett, Peter Mensah, Daniel Feuerriegel
Factual error: One of the naked female dancers at the party has breast implants. Although some forms of plastic surgery were known to the Romans, breast augmentation was not one of them. If you want to check for yourself she appears just after the masked dwarf moves through the shot.
Gannicus: I knew you'd lead these men to their deaths eventually. Is this the day you would do it?
Spartacus: They are but loyal. A quality you seem unfamiliar with.