When Sara Sidle and the NTSB agent are working together Hodges leans in then says three's a crowd. He then back off and goes to analyze a paint chip saying "Come and knock on my door" as he walks off. This is a reference to the theme song from the 1977 TV show Three's Company. Come and knock on our door... (Come and knock on our door) We've been waiting for you.... (We've been waiting for you) Where the kisses are hers and hers and his, Three's company too.
While Pamela Reed and Kenneth Williams had no scenes together, they worked very closely, playing mother and son, on another CBS drama, Jericho.
After meeting NTSB Investigator Doug Wilson again, Sara Sidle starts wondering about her relationship with Gil Grissom, which sets the scene for events in Forget Me Not (2013).