This movie has a lot of the formula stuff in it, but they seem to have a little different flavor to them. Fiona gets an audition rejection and Helen's shop is flooded, so it's time to go search for their roots. The obstacle to the romance and the climax both fit the mold of so many other rom/coms, but with a slight twist after the die is cast.
The way the issue of the birth-mom was handled seemed a little strange. The mom found Helen and wrote her a letter. I don't recall any discussion of how Helen was raised or ended up in America. Still, this part of the story is the hook for the movie.
Fiona considers herself about as unlucky as can be and evidence seems to support that (except for darts). Making part of the story about Fiona actually chasing luck is an unusual story angle. There is almost a mystical quality to this part of the story.
The epilogue ends abruptly. It sure seems like something more was intended.
