David Ogden Stiers included a personal note with his phone number for Loretta Swit during filming of the M*A*S*H series finale. The gesture created a genuine reaction from Swit that appeared on screen.
In the final episode titled Goodbye Farewell and Amen Charles hands a book to Margaret. Swit opened it during her close-up and discovered the message was addressed to her rather than her character. She later described the moment in an interview with Woman's World noting that viewers can see her real reaction upon rewatching the scene.
