In the flashback where Lolly's cart get stuck and she talks to 2 bike cops, she is supposed to be in Seattle, but you can see Tyrone House in the background which is in Yonkers, NY.
Piper gets branded by the Spanish girls on her left hand, but in season 6 episode 9 when she is giving one of the girls a paper to sign, the scar is on her right hand.
When Chapman gets branded it was on her left arm. Later through the episodes it is switched from her left arm to her right arm.