Revealing mistake: When Holly is in bed with William, and then finds out that he is 'Billy from the band', just as she pulls away from him to bolt out of bed, the modesty top she wears is quickly seen.
P.S. I Love You (2007)
1 revealing mistake - chronological order
Continuity mistake: After Holly and Gerry’s argument near the start, when Gerry begins his little dance in boxers, as he removes his leather jacket one of the back suspender clasps comes undone. When he lies down beside Holly, both back clasps are on properly. (00:10:45)
Holly Kennedy: Do all Irishmen sing?
Gerry Kennedy: Only the really well hung ones.
Trivia: Hilary Swank was injured during filming when Gerald Butler's suspender belt snapped off and struck her in the forehead. The cut she suffered required several stitches.