"You are about to enter another dimension."
The Twilight Zone - Easter Eggs & Hidden Details
Easter Eggs
The filming location known as Courthouse Square on the Universal Studios backlot was used for the pilot episode, "Where Is Everybody?".
This iconic set is instantly recognizable to film fans as the same central location for the town of Hill Valley in the Back to the Future trilogy, creating an interesting visual link between two major science fiction franchises.
A recurring name, 'Cadwallader', appears in multiple episodes.
In the episode "Escape Clause," the devil is named Cadwallader. The name reappears for a different character in "The Man in the Bottle." This was an inside joke by Serling, who often used character names from his life and experiences in Binghamton, New York.
The episode "A World of His Own" features a unique breaking of the fourth wall.
In the final scene of the Season 1 finale, the episode's protagonist, a writer who can bring characters to life, is confronted by Rod Serling himself. The writer then uses his power to erase Serling from existence by throwing his tape description into the fireplace. It was a meta, humorous ending that directly acknowledged the show's creator within its own fictional world.