Continuity mistake: When Sister Aloysius is walking Mrs. Miller to work, the Sister's umbrella handle is hooked to the left, then hooked to the right in the next shot. (01:12:10)
Factual error: When Meryl Streep is walking outside and talking to Mrs. Miller about the potential abuses of her son, you can see a basketball court in the background and on the court is a 3-point line. The movie is supposed to take place in 1964 and the 3 point line wasn't introduced until 1979/1980. (01:10:20)
Sister James: I don't think Father Flynn did anything wrong.
Sister Aloysius Beauvier: You just want things to be resolved so you can have simplicity back.
Trivia: Viola Davis was nominated for the Best Supporting Actress Oscar for her role as Mrs. Miller, even though she's only in the film for 8 minutes.