This slip up takes place when lucy is Introducing, Jack Quincy and Art to Mina at the house party, Quincy has already come in and he is standing beside the love seat, and Lucy is distracted by Jack's enterance, when Jack stubbs his foot on the stuffed animal Lucy takes him to the couch to sit down while Quincy is standing.. If you look Quincy is holding his hat in his hands, but in the shot where Art comes in and Lucy goes running to him, Jack stands up hands Quincy his hat and remarks " Sorry about your hat." the hat which Quincy was holding when Jack sat down.