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Dr. Cox's (John C. McGinley's) trademark of calling J.D. by girls' names is what McGinley does in real life (jokingly) to his good friend and neighbor, John Cusack.
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Bill Lawrence and a few of the writers jokingly claim that Neil Flynn (The Janitor) has never actually spoken a line from any script. A fourth season script reportedly even contained "(Whatever Neil says)". While Lawrence's comment is certainly an exaggeration, it illustrates how much of his performance is spontaneous.
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Dr. Cox's (John C. McGinley's) trademark of calling J.D. by girls' names is what McGinley does in real life (jokingly) to his good friend and neighbor, John Cusack.
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Every episode was scripted, but the actors had the choice to improvise their lines if they thought of something funnier.
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Ted's (Sam Lloyd's) "band" is "The Blanks", a group Lloyd formed with his friends at college.
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It was Zach Braff who suggested using the song "Superman" by Lazlo Bane as the show's theme after listening to the lyrics and finding them in mood with the pilot.
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