There was this scene where Scofield was queuing up getting a glass of water in Sona. The cup filled about 1/10th of its content but the next snap shot shows it is almost half filled.
The photo of Sara is actually two photos. On the first her hair is slightly in her face, covering her left eye, and a blue wall can be seen behind her. On the other photo her hair just frames her cheeks and a brown wall is seen behind her. The closeups of the photo are of this second picture and is the only one seen inside Sona. The other one is only seen outside of Sona.
When Micheal is talking with Sara we can clearly hear that another actor portrayed her voice.