'That was Demi Moore ...'
When Martin tells Anna Scott that "Ghost" was his favourite movie (thinking she had played the lead), she corrects him saying, "That wasn't me, that was Demi Moore."
I thought it would have been hilarious if Martin had instead chosen a film like Erin Brockovich or Runaway Bride, and Anna had said, "That wasn't me ... that was Julia Roberts."
THEN they ended up using a similar joke in Oceans 12 when Julia Roberts's character Tess tried to pass herself off as actress Julia Roberts!