Strickland: [to Elisa] What'd you say to me?
Elisa: [Signing] F - U - C - K
Strickland: What is she saying?
Elisa: Y - O - U
Zelda: Uh, I, I didn't catch it.
Strickland: [pointing at Elisa] what is SHE saying?
Zelda: She is saying "Thank you".
Giles: If I told you about her, what would I say? That they lived happily ever after? I believe they did. That they were in love? That they remained in love? I'm sure that's true. When I think of her - of Elisa - the only thing that comes to mind is a poem, whispered by someone in love, hundreds of years ago: "Unable to perceive the shape of You, I find You all around me. Your presence fills my eyes with Your love, It humbles my heart, For You are everywhere."
Answer: IMDB often has a "connection" section that has some of these trivia facts. "The Story of Ruth" (1960) was playing in the theater. But so far that's the only old movie played that is listed. "Mardi Gras" (1958) was seen on the marquee.