Sam (portrayed by Stephen Simon) talks to Garcia about ukulele lessons. Simon is a member of The Ukelele Orchestra of the Western Hemisphere.
As the unsub is reading a binder labeled "Laurel's Open Window," a scene is shown of an unsub breaking into Laurel Tyson's house through a window. Reid and Morgan mention the window as the source of entry, but the same window from before is not shown. This is because the window break-in scene is reused from The Stranger (2011), when that unsub breaks into Amber Lasko's apartment by using the window.