Trivia: On the promotional movie poster, a frazzled Steve Martin is shown holding 2 children upside down by their ankles. On the set, sometimes the children would get unruly, so as a joke, Steve Martin once grabbed 2 of the unruly children and actually held them upside down by their ankles. Director Ron Howard saw this and decided it would make a funny promotional picture, so that's where he got the idea for it.
Trivia: Director Ron Howard's real-life daughter, Bryce Dallas, is the redhead girl in the audience during the play.
Answer: If a child becomes estranged from their father after their parents have divorced, it's not all that uncommon for the child to take their mother's maiden surname instead of their father's.
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