Deliberate mistake: When Michaela reads "The Once and Future King" to Lorenzo, she doesn't start at the beginning, even though she's never read him that book before. Not only does she not open the book to the first page, the words she reads are not at the beginning of the book (I believe they are about three or four chapters in).

Lorenzo's Oil (1992)
Plot summary
Directed by: George Miller
Starring: Susan Sarandon, Nick Nolte, Peter Ustinov, Kathleen Wilhoite
Genres: Drama
Nick Nolte and Susan Sarandon are intellectual parents Augusto and Michaela Odone, in a relentless search for a cure for their son, Lorenzo's, Adrenoleukodystrophy (ALD).
More mistakes in Lorenzo's Oil More quotes from Lorenzo's Oil
Augusto Odone: Michaela! They are the same enzyme! There is one enzyme for both chains. It's the same bloody enzyme.
More questions & answers from Lorenzo's Oil
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Answer: It's "Casta Diva" from the opera "Norma" by Bellini.