The guitar that actor Trevor Donovan played throughout the film was made by the Cinematographer, James W. Wrenn.
Was listed as Easy Heart on Pixl, 2-6-2017
Trevor Donovan sings and plays the guitar in real life, and he does so as the character Jason Keith in this movie.
Shelley Long's character and those of her two friends make up "The Berry Bunch" in the movie. This was likely a nod to Long's role as Carol Brady in "The Brady Bunch Movie" (1995), "A Very Brady Sequel" and "The Brady Bunch in the White House" (2002).