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)
Ending / spoiler
Directed by: George Miller
Starring: Susan Sarandon, Nick Nolte, Peter Ustinov, Kathleen Wilhoite
Genres: Drama
Lorenzo is showing improvement like swallowing for himself and answering "Yes" and "No" questions by blinking, he has also regained his eyesight and is learning to use a computer. The credits roll showing children who were treated with the oil Augusto had created.
More mistakes in 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
Answer: It's "Casta Diva" from the opera "Norma" by Bellini.