Garber did not forget the lyrics. He didn't drop the baton by mistkae either. That was all part of what "Live, Laugh,Love" is about, not much longer after that he breaks down. By the way, he was brilliant during this number, and his cry of help to Phyllis was one of the highlights of the night. Plus, he had an incredible chemistry with Murphy, their scenes together got the most reaction from the audience.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"