(in order of appearance) 

Brent Marshall (young father)

Sarah Marshall (wife)

Melissa Marshall (their daughter - about 5 or 6 years-old)

Millie (very absent-minded, inept secretary)

Al and Gilbert (coworkers of Brent)

Readers in the choir 

Nurse

Mike Bennett (friend of Sarah's from church)

Ann Bennett (Mike's wife)

extras (shoppers in a "downtown" scene)