According to the Christmas 2006 issue of People magazine, Jeffrey Dean Morgan had to learn to play the guitar for his part in this film in a very short time. His guitar instructor was Nancy Wilson of the band Heart. Morgan was thrilled to take lessons from her, because, in his own words, "I had such a crush on her as a kid."
The whole letter Gerry sent to his mom and dad in Ireland says: "Dear Mum & Dad. Well, Doc says there's not much time, so I thought I'd write to you, seeing how bad we Kennedy's are with modern day contraptions like telephones. Tell Dad to not lay about, and to take care of his legs-keep them walking. I always think of Dad walking across the farm yelling after the hands too lazy to keep the chickens fed. And you Mum, yelling at Dad to treat the boys with a Father's hand, not a father's belt. I remember everything Mum. And I thank you for giving me a mother's breath of life and love. No son ever loved a mother more, I can tell you that. Never could say it to your face. Nor to Dad. But I love you."
During Holly's dream sequence (when she asks "Do all Irishmen sing?" and he answers, "Only the really well-hung ones"), Gerry is on an acoustic guitar, and singing "Love You Till The End" by The Pogues.
Ouest Restaurant where Holly and Daniel tried to have dinner is on 2315 Broadway, New York, NY 10024 now shut down and renamed into another restaurant/ cocktail bar called Maison Pickle. You can still make out the Ouest restaurant sign in the background.