Jennifer Love Hewitt and Joseph Lawrence knew each other prior to filming. They dated when they were teenagers.
Jennifer Love Hewitt and Sonja Bennett also starred in The Client List (2010)
The scene at the fauntain when Katya (Jennifer Love Hewitt) and Charles (Colin Ferguson) are eating hot dogs, is pretty much the same as the Ghost Whisperer season 2 episode 8 story of how Melinda (Jennifer Love Hewitt) and Jim (David Conrad) met at the umbrella room.