Factual error: When Aston Kutcher is getting the first text from Natalie Portman, you can see his iPhone is showing June 12 on the lock screen as the current date. The text from Emma have also a date of "06/12/10" next to it within Messages app. On iPhone, the texts received on the same day should only show time at which message arrived, and not a date.
Factual error: When Aston Kutcher is calling every girl in his address book he is using an iPhone. In one of the shots you can see the screen lighten up as he's chatting to the caller. If he was really on the call, iPhone would switch off display in proximity to ear to avoid unwanted key strokes and save battery.
