Audio problem: When Gretchen kills the guy in the prison he lets out a very obvious fake scream similar to a Wilhelm scream. Also, he is being choked around the neck, how is he able to make the scream? Take note of when you see this scene in the next episode's review. The guy doesn't make the scream in that version.
Prison Break (2005)
1 audio problem in Safe and Sound
Starring: Dominic Purcell, Robert Knepper, Wentworth Miller, Amaury Nolasco
Continuity mistake: On the tombstone in the previous episode, Michael's date of death is 11.4.2005. But in this episode, when Linc goes to the graveyard to visit Michael's grave, his date of death is 11.4.2010. It is also a different grave from the original, as the original was in South America beside the beach, and here we are led to believe it is in New York. (00:50:50)
Riots, Drills and the Devil: Part 1 - S1-E6
T-Bag: Can't you transfer us some place cooler? Like Africa? (00:16:20)
Trivia: The show was filmed in an actual prison (now unused) in Joliet. The death row cell used for Lincoln Burrows is the actual death row cell that held serial killer John Wayne Gacy.
More questions & answers from Prison Break
Answer: Because of coincidence.