Continuity mistake: When Piper confronts Alex in the bathroom (saying "you named me"), When Alex turns away you can see that her salt shaker tattoo is upside down.
Moscow Mule - S1-E8
Continuity mistake: Mercy, who was released several episodes earlier, can be seen sitting at the table when Maria comes back in.
Continuity mistake: Near the beginning, Piper is sitting on the toilet and you can see her new engagement ring on her finger. When she wipes her eyes with the tissues the ring has vanished. A couple of shots later the ring is back.
Lesbian Request Denied - S1-E3
Continuity mistake: Larry and Cal are cooking hot dogs over an open fire. Larry starts out with a straight stick, Cal with a curved stick. Larry puts his hotdog on the curved stick, then has the straight stick as he puts it over the fire. The swap happens again and Larry ends the scene with the curved stick. Also, the tip of the straight stick swaps from a sharp point to a dull point. (00:40:30 - 00:41:50)
Blood Donut - S1-E7
Continuity mistake: When the girl is holding the flash light to her face, the next shot it's the other way around, then a couple of seconds later it's the first way again. (00:14:40)
Continuity mistake: As 5 women are walking through the park several extras can be seen in the background. Camera angle switches to aerial view, and the 5 women are the only ones in the park. (00:27:05)
Answer: You would need to be more specific as to which inmate to get an answer as to who possibly belongs in the mental ward. In general; usually the only mentally ill prisoners who go to the mental ward are inmates who show obvious psychotic breaks like Loli and crazy eyes as, with the conditions of prison, it's often difficult to tell who is mentally ill and whose frustrated from the conditions. Many of them are also only there temporarily. Crazy Eyes, first example, was in the mental ward. Her mother fought and won to get her out.