 The scene when Jack brings Liz a diamond necklace to wear and snaps  the box on her fingers refers to an unscripted scene in Pretty Woman  where Richard Gere brings Julia Roberts (also wearing a red dress) a  diamond necklace and snaps it on her fingers causing her to laugh  out loud. In the scene in 30 Rock, however, instead of laughing out  loud Liz begins swearing that her fingers were hurt.