Deliberate mistake: To keep things simple, the movie relies on the Lancaster County Sheriff as a county police force. In reality, the county sheriff serves the county court (transporting prisoners, for example) but does not serve as a county wide police force. In PA, each city, borough, and township has its own police force. Note the varied colors of police cars at the farm in one of the final scenes. These were borrowed from the various local police forces (Lancaster City, for example, is robin egg blue with a white top).
Witness (1985)
1 deliberate mistake
Directed by: Peter Weir
Starring: Harrison Ford, Danny Glover, Viggo Mortensen, Lukas Haas, Kelly McGillis, Josef Sommer
Plot hole: When John tries to start his car with the flat battery the least he should have done is switch the windshield wipers off. (01:33:50)
Det. 'Fergie': What you doing, man?
Det. Lt. James McFee: Washing my hands, man.
Trivia: This is the only movie Harrison Ford has ever been nominated for an Oscar.