Factual error: In the final scene where Solomon was reunited with his family, the doors he entered the room through had Edwardian style leadlight glass. The movie was set about 50 years before this style.
Factual error: In the close-up of the violin being strung, it is obvious the strings are of contemporary origin. You can see they are translucent plastic; not exactly historically accurate.
Answer: Few slaves would have had healthy, straight white teeth or had access to professional dental care, which was not very advanced at that time and it was painful. This is a detail the filmmakers either deliberately chose to ignore or were careless in how they depicted the characters' conditions.
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