Okay, so this is a copy of It Happened One Night. Big deal. There's actually a fair amount in it that is different. The basic elements are the same: Girl runs away from dad/grandfather and dodges the detectives but comes face-to-face with a reporter hiding his identity from her.
I would say that the primary difference between films is the attitudes of the leading men. Clark is essentially blackmailing Claudette in IHON, while in this film, Fredric doesn't seem to have any intention of publicising Virginia - he doesn't want to write the story in the first place, keeps delaying the finish of his story, and finally he rips it up and refuses to do it at all. In TGMH, there is also a strange but amusing supporting actress who works in the same store as Virginia does. Oscar Shapely of IHON is not her equivalent, though amusing in his own way, believe you me.
It Happened One Night is definitely the more solid of the two movies, but There Goes My Heart is fun to watch and should be more actively viewed than it is, instead of being condemned by a majority that probably hasn't seen it, but bases their opinions on the negative reviews of others. I myself was sceptical - I just watched it prepared to react whatever way the movie led me, and I have to say that I did like it and would definitely see it again.