Continuity mistake: When Angie tries to smuggle cake out of the cafeteria, she puts away her tray and then tries to slip after the guard. When he stops her, she turns to make her way back to the now empty table; in the next shot, the tray is on the table once again. (00:16:25)
Continuity mistake: We see Sophia's long hair from the side as we watch Red and Mendoza talking. A minute later, we turn back to see her face and she has a short shoulder length haircut. (00:48:10)
Answer: On the show, orange uniforms are worn by the new inmates, while the khaki is the longer-term population. Generally, there's no standardized meaning of the colors as every prison has their own color-coding system. For example, red could mark more dangerous inmates. Other colors could indicate lower-risk prisoners, ones with health issues, area designations, and so on.
raywest