Revealing mistake: When Atticus kills the mad dog, you can see its hind legs being pulled by someone off screen. (00:43:05)
Revealing mistake: Scout's hand is made of fiberglass as can be seen in the close up when they are attacked.
Revealing mistake: In the final wide shot of the courtroom scene, as Atticus sits down, Phillip Alford (Jem) seems to think the shot has cut, as he suddenly hops up from his position slumped against the banister and playfully drums his hands on the railing.
Answer: The film is set in Maycomb, Georgia. There's no explanation, so any answer is speculation. However, Atticus usually wore a three-piece suit, so it was a vest, not a sweater. The suit was likely a lightweight material and was a typical style of the era. Atticus probably considered it a more professional look for a lawyer. Most likely this was a movie wardrobe decision, giving Atticus a scholarly appearance and persona throughout the film, even if in reality, it wasn't practical.
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