Revealing mistake: In brother Justin's padded cell, the far wall is obviously a painted backdrop. It even flutters when the orderly and doctor walk in! The only solid part is a couple of feet at the end, that Justin leans up against.
Factual error: Outside the church headquarters where Norman has his stroke is a board saying 'United Methodist Church'. The UMC didn't come into existence until 1968. It was the Methodist Episcopal Church in the 1930s.