The names of the daughters, Maggie (Lauren Graham), Milly (Mandy Moore), and Mae (Piper Perabo), come from an e.e. cummings poem that starts "Maggie and Milly and Molly and May went to the beach to play one day." A student in Johnny's guitar class is named Molly.
A photo of a younger Diane Keaton that appears in this film is also featured in The Family Stone (2005).
The actual cakes used in the movie are made by the Cake Divas - they have created one-of-a-kind cakes for numerous movies and television shows: Buffy the Vampire Slayer (1997), Charmed (1998), Arrested Development (2003), Judging Amy (1999), ER (1994), NYPD Blue (1993), The Division (2001), The Drew Carey Show (1995), JAG (1995), MTV Video Awards, Comedy Video Awards and many more.
Lauren Graham's character is seen wearing a Barnard sweatshirt, where the actress actually attended college.