Henry: Happy birthday, sir. What are you, like, 200 today?
Henry: Actually I'm not drunk at all, Noreen, and neither are you, because there's no alcohol in these drinks. Sadly, I've used this technique many times. It helps lovely tourists such as yourself loosen up without impairing your ability to stay awake all night and have guilt free vigorous sex with me.
Noreen: Wow.
Ula: Oh, you crazy bitch.
Lucy: Yeah, keep running.
Henry: I was petting my walrus all morning and I was thinking of you the whole time.
Lucy: Okay, pervert. I think that you should leave.
Henry: What? I was just joking around because of what we talked about yesterday.
Lucy: Yesterday? I've never even met you.
Marlin: You sure you don't want to take Doug with you?
Henry: Hey! What the heck are you guys doing here?
Dr. Keats: Little Sammy Sosa's a bit shook up, but she'll be okay. She's watching the tape as we speak.
Henry: Good. How's my temporal lobe looking there, Doc?
Dr. Keats: Don't worry. You're not gonna suffer any short term memory loss. But was your head shaped like an egg before she hit you?
Doug: Hey! Don't make fun of Henry, all right? It'th not hith fault hith head'th thaped like that.
Dr. Keats: Note the intense overreaciton. That's the 'roids talking.
Chosen answer: Lucy's father previously told Henry that she only sings on days that she meets him - then you see a flash of her painting in the garage, singing a Beach Boys song. Right before he hands Henry the Beach Boys CD, he tells him that she's even singing again. Henry realized as he listened to CD - maybe if she is singing again, she is thinking of him, hence, remembering him. (It happens to be the same song that she was singing in the garage that's playing on the boat when Henry turns around to go back. It's called 'Wouldn't It Be Nice').
Why wouldn't the father just tell him directly "hey she's been painting and singing again, so she probably might remember you"