Continuity mistake: When Benjamin is running up the stairs of his rooming house with a stack of presents and a big bouquet of flowers, the flowers are pointing down held by his left hand with the presents in front of him. When he rounds the corner of the stairs, the flowers are upright in front of both him and the presents.
Trivia: A change from the theatrical re-release for the 25th anniversary and the video release. In the first Taft Hotel bedroom scene, a nervous Ben asks Mrs. Robinson if she would like "Wood or Wire [hanger]?" In the theater, her response was, "wood." Which led to the wonderful pratfall of Ben trying to take the wood one, which wouldn't come off. But it was changed in the 25th anniversary video release and her response was, "Either one would be fine."