Each episode's title card is accompanied with audio containing only Morse code (dots and dashes, or short and long beeps) which, when translated, provides a short hint (around 3 words) about the episode to come.
Was aired in Australia within a day of being aired in the US up until the mid-season break. After the break, Network Ten failed to return the show to air for around 2 months after the US. This delay, combined with lack of advertising and a poor time slot led to Jericho being "shelved" after Episode #1.13 "Black Jack". This is a fate shared by several other cult shows, such as Battlestar Galactica (2004).
A reference in one episode of a radio message announcing "Senator Morrisette is making his move" is a reference to producer Keira Morrisette's father, Bill Morrisette, who was an Oregon state senator at the time.
In season 1 episode 5, when the library is on fire, Eric Green is tossed a snake to block the smoke. When smoke begins to flow from another door, he needs another snake, they cannot find one, we even though you can clearly see an orange snake where they found the green snake at.
The trivia items below may give away important plot points.
When CBS canceled Jericho in May 2007, fans began sending nuts to CBS in reference to the shows final episode, in which the main character referenced the Battle of the Bulge when he answered "NUTS" to a request to surrender. Three weeks later, over 8 million nuts had been shipped to CBS NY and CBS LA offices totaling over 40,000 pounds. Nina Tassler, president of CBS, sent out a memo on 6 June 2007 saying they have ordered seven more episodes to air within the year. They also asked the fans to stop sending nuts...
One interesting note is that the morse code heard on the title screen is different for each episode, and gives a clue about that episode. Here's the list: Episode # - Episode Title - Morse Code Message S1E1 - Pilot - Jericho Pilot S1E2 - Fallout - Jericho Fallout S1E3 - Four Horsemen - Jericho Three S1E4 - Walls of Jericho - He Knows Rob S1E5 - Federal Response - There Is A Fire S1E6 - 9:02 - The EMP Hits S1E7 - Long Live the Mayor - Pray for NYC S1E8 - Rogue River - Rob Not FBI S1E9 - Crossroads - AOV Surprise (AOV may mean Area of Vulnerability) S1E10 - Red Flag - It Begins With S1E11 - Vox Populi - 6 And Ends With S1E12 - Recap - ***This was a recap episode, so some numbering sequences (like Netflix) count it as Episode 12...others just count it as another number 11, so the following numbers may be one episode off. S1E13 - The Day Before - Bloodshed (Last three codes were a contest riddle: "It Begins With 6 and Ends with Bloodshed.) S1E14 - Blackjack - Bleeding KS S1E15 - Heart of Winter - 4 Down 4 to Go S1E16 - Semper Fidelis - They Will Need It S1E17 - Winter's End - A Costly Deal S1E18 - One Man's Terrorist - Rob Exposed S1E19 - AKA - Who Ran Red Bell S1E20 - Casus Belli - One Got Away S1E21 - One if by Land - We Pledge S1E22 - Coalition of the Willing - Allegiance S1E23 - Why We Fight - To The Flag (Last three say, "We pledge allegiance to the flag") S2E1 - Reconstruction - We're BAAACK S2E2 - Condor - J&R Ran Boxcar S2E3 - Jenning & Rall - Caller Knows All S2E4 - Oversight - A Costly Death S2E5 - Termination for Cause - Tho It Is Dark S2E6 - Sedition - Know Our Flag S2E7 - Patriots and Tyrants - Is Still There (Last three say, "Tho it is dark, know our flag is still there")