The part of Kate
After reading the discription of this movie and seeing the cast I thought for sure Joey Lauren Adams would be the mother that ran off and Monica Potter would be the new love interest.
Maybe I thought this because of Monica Potter's work on Parenthood she just seems so nurturing I couldn't imagine her running off. Or maybe I picture Joey Lauren Adams as the flakey mother with her quirky voice. I just didn't see that coming. I think they could have swapped the roles of the two actresses or maybe it was just a miscast of Kate.
I'm probably being bias cause of Parenthood and had I seen this movie when it first came out I may not have not felt the same.