(at around 39 mins) When Sam is searching for Alia/Angel and Vivian (the helpful guard), in what appears to be the basement, Sam finds Vivian who asks, "Sam, what the hell am I suppose to do?" She should not know that Liz is Sam until the very next scene.
Fiddler is said to have a hearing problem, but when she is talking to Sam in the cell block, despite lots of ambient noise and Sam not speaking very loud, she hears him just fine.
(at around 43 mins) When they are along the embankment in the stream, in the top left side of the screen, a pair of woman's hands with red nail polish holding a black box with 3 white vertical stripes can be seen.
After Zoey leaped into the prison warden Clifton Myers, her hologram Thames informs her that "'Nobody' is in the holding chamber." Although this makes sense concerning the inmate Alia leaped into, it's unusual that Myers would not be in this room.