I read Patti's book back when it came out last year, and I don't have the text in front of me, so my details are kind of fuzzy. Here's what I remember:
1. I believe Patti wrote that there was talk at the time of another singer recording "I Dreamed A Dream" at the time of the London premiere, which pissed Patti off (a la Streisand recording SUNSET BLVD songs). She might have walked out of rehearsals/performances and had to be calmed down by Trevor Nunn.
2. She recounts (as she's often done) the incident when she got out of costume and turned her intercom off during a performance, only to miss her final entrance in the show because she was reading Vogue and smoking in her dressing room.
Other than that, I'd say the LES MIS section is decidedly tame. Anyone who's read the book more recently can add/amend/correct what I posted.
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body