Factual error: The prison in this film, Huntleigh prison, can't be very secure as the hinges are on the inside of the cell doors and the front gate opens directly into the exercise yard.
Factual error: Lenny says that he has seen the film "danger within" which was released in 1959 but two way stretch was released in 1960 and in this film Lenny has been in prison for the last three years so he couldn't have seen danger within.