Lucy lacks emotion
I'm a Beatles fan and I loved that movie.
However, I think Lucy overact and doesn't sing very well: though she's got a technically perfect voice, she lacks emotion which she substitutes effects to.
But somehow, as she's supposed to be a well-educated WASP teen it goes very well with the character.
I still don't understand why Jude would not hookup with Prudence... ;)
BTW, it's a pity that the version of "Hold me tight" we hear on the soundtrack is not the Liverpool/Suburbia medley we hear during the movie.