The original script, depicted Gnaeus (Raicho Vasilev) as being the Gladiator called to accompany Cossutius in having sex with Diona. However, Raicho had strong reservations about acting in a scene where a woman is "raped" and would not participate in filming it. So the character Rhaskos was filmed instead, as actor Ioane King did not share such reserve.
When Gnaeus (Raicho Vasilev) fights Barca in the arena, he fought in the style of Thraex (characterized by his weapon and shield.) Thraex was a style modeled after the soldiers of Thrace; which would become modern day Bulgaria. Raicho is from Bulgaria.
The armor that Oenomaus wears after becoming Doctore has a patch beneath the left breast. This is where Oenomaus stabbed the previous Doctore during their fight. From this episode and in the previous episodes of Gods of the Arena the patch is there as a reminder of this right of passage. This patch was visibly present during the season "Blood & Sand."