The piece Laura plays at the end of the episode is Chopin's 24 Preludes, Op. 28, No. 4 in E Minor.
First instance in which Laura's name is used in the title's play on words.
At the end the note left on the piano says "Play it again, Sam". This is obviously left by Remington in reference to the famous misquote from his favorite movie, Casablanca.
Movie reference: Claudette Colbert in It Happened One Night, Clark Gable, Columbia, 1934