Marilu Henner has several roles in Unforgettable. As an actor, she plays Carrie's aunt Evie. She's a producer on a dozen episodes. And she's a consultant for the series.
Marilu Henner, as Aunt Evie, says to Carrie, "I'm sorry I don't have your powers of recall." In fact, she does. In real life, Henner has hyperthymesia, the gift of perfect recall that Carrie has in the series.
The song, "Nick of Time," was written and made famous by singer Bonnie Raitt. In this episode Marilu Henner is actually singing it.