- The character of Jason reappears in the books Along for the Ride and What Happened to Goodbye.
- Stella, the woman who owns the garden and gives Macy directions to Delia's home, is seen reading a novel by Barbara Starr, Remy's mother in This Lullaby.
- When Macy turns on the weather channel she mentions that Lorna McPhail was delivering the daily forecast. Lorna McPhail is Haven's stepmother from That Summer.
- Wes is mentioned in Along for the Ride by Jason; being referred to as "the juvenile delinquent welder with a tattoo".
- Kristy and Bert wearing an "Armegeddon Expo '06" T-shirt are mentioned in Lock and Key at the mall where Ruby works.
- Macy and Wes are seen eating waffles together in Just Listen. They are described, "On our other side there was a couple about our age eating waffles, both in running clothes: The girl had blonde hair and an elastic around her wrist, while the guy was taller and darker, the bottom part of a tattoo just visible under his shirtsleeve."
- Wes and Burt are mentioned as cousins with Luke, Emaline's boyfriend in The Moon and More.
- Macy's dad mentions a place called Last Chance, which is a cafe mentioned in Along for the Ride and one setting in Keeping the Moon.
- The neighborhood Wildflower Ridge that Macy's parents were building is the neighborhood where Nate and Ruby from Lock and Key lived in.
- Evergreen, the rehab mentioned, is the same one from Dreamland.
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