Oh god, it was so badly edited
Its like someone filmed a movie then it was attacked by a pack of wolves and sown back together again from the remaining parts. It kept going from one scene to the next scene so randomly and with crappy transitional effects sometimes too.
And holy hell did this movie overdo the music, it was a relief when the music just stopped for a minute so we could actually hear the characters TALK.
And Rachel McAdams performance as a scatty, woman child was really bad which is sad because she's such a charismatic actress.