Donizetti's Lucia di Lammermoor shows up in Madame Bovary (1949). We get part of the love duet "Ah! verrano a te sull'aure" and the first bit of Act I Scene 3. It's a wee bit odd that they use the break between those two scenes to let the characters be up and about rather than a genuine break between acts, particularly as the characters end up skipping out on Act III entirely. Well, sheesh they aren't even to Act II yet (two more scenes to go!), and if they have breaks at every scene, I'm surprised they didn't just duck out after Act I! LOL!
"I said that I did like the opera... everything except the music." -- Charles Bovary