Trivia: For those who don't (or can't) read American Sign Language, at the end of the episode, Grissom says to Dr. Gilbet is that his mother lost her hearing when she was eight years old. He once asked her what is it like to be deaf, and she told Grissom (who loved to swim) that it was like being underwater. She also taught him that being deaf does not make one inferior to others. Dr. Gilbert then replies that she teaches her students the same lesson.
Trivia: The man who flirts with Catherine at the bar is played by Marg Helgenberger's husband, Alan Rosenberg. According to Helgenberger on the DVD commentary, Rosenberg had difficulty treating her the way his character does, even though it was a fictional encounter.
Trivia: Season 9, episode 20, titled "A Space Oddity"- In the scene where Simms translates the alien language that Hodges spoke to her earlier in the show with the Vellikon translator on the Astro Quest website, the alien alphabet that is shown on the computer screen is the same alphabet used in the Star Wars Universe, not Star Trek, which the show is modeled after. (00:41:15)
Trivia: The plot of this episode is similar to the plot of "Erin Brockovich" - a water supply being contaminated. Ecklie even calls Catherine Erin Brockovich at one point. Marg Helgenberger, who plays Catherine, was in "Erin Brockovich" as Donna Jensen, one of the people who became sick due to the contaminated water.