It's the scene where daughter Lucy is playing the trombone and the president walks in to surprise her with a history book. When he hands her the book, his right hand is on the spine. Her trombone is in her left hand. When she grabs the book, she should be grabbing the side with the pages exposed with her right. However, she is grabbing the book with her right but the spine is in her hand. Slow it down and check it out!