About the movie- plot

A guy emails a girl trying to get a date with her but misses the correct spelling sending it to another lady in the same office.
This new pairing actually hit it off while the guy actually does date the girl he actually thought he was e-mailing!

This good weave on how a mistake can lead to all sorts of other mistakes. It does get complicated. But the mistake is explained at the end. Something which I hadn't thought of.