When the members of the brotherhood beat up Mani until he is dead, they pick him up above their heads. The tattoo on his torso appears to be on his right side, whereas in previous and following scenes the tattoo is on his left side. That shot is flipped.
All of the characters in the film actually existed during the time of Louis XV with the exception of Mani. If you watch the DVD version, you'll see this in the production notes.