Formulaic romantic comedies should be down to a check list form with quick checks for sanity by now. There is no hiding the fact that these low rent 'films' are a quick painless cheque for everyone involved, and made by Hollywood studio executives. (The director is just the guy who tells the DP where to point the damn camera.)
Simplicity itself. Make a few calls to down-on-their-luck or up-and-coming actors, get a leading man who looks like a Greek God and has the personality of oatmeal, and an actress who is cute, people vaguely know, and can be suitably blonde. Get a director out ....