Corden met Jones on the set of Fat Friends. It was then that he told her about a friend's wedding where the groom was English and the bride was Welsh. This was what inspired Corden and Jones to write a show about a long-distance relationship and co-star in it too as Smithy and Nessa. The two play Gavin and Stacey's respective friends. Although they say they hate each other, the two have several one-night stands in the show and Nessa even ends up pregnant with Smithy's baby.
Almost every episode of this show starts with a phone call between Gavin and Stacey. This was a strategic move. It was a way to remind the audience that these two were suffering through the struggles of a long-term relationship. The show has only 20 episodes but in these episodes, we see the main characters going through key moments of a relationship like meeting for the first time and getting their families to meet each other during the holidays.
The ‘Barry’ house is where Stacey, her widowed mother and Uncle Bryn can be found in the show. Turns out, the house is a real house. Someone actually lived in that house. During filming, the occupant would move out for a few days to give the crew space.
Uncle Bryn is Stacey's uncle on the show who will crack you up with his antics. But his antics didn't just make the audience laugh on the show. Rob Brydon, the man behind the character, would liven up the set too. He often treated the cast and crew to his antics and make them laugh.
The characters on the show are based on real people. This is what makes the show so relatable. Corden based his character on a friend of his cousin and the rest of the characters are based on people they had met while filming Fat Friends.
Gavin's parents’ house was said to be in Essex. This is why Gavin and Stacey must endure a long-distance relationship because she lives in Wales. But the filming of the scenes wasn't actually done in Essex. Some scenes were shot in London and the rest of the scenes were shot in Wales, even those which were said to be in Essex.
Remember the episode with the Elvis convention? Nessa and Uncle Bryn gave us a show while donning cowboy hats and demin jeans. Well, that was based on a real convention. It takes places every year just 25 miles away from Barry.
Corden sent Matthew Horne a text message to let him know that he was chosen to play Essex-boy Gavin. "So chuffed you're doing it," Corden texted him. It would be the start of a bromance. Much like Smithy and Gavin, Corden and Horne would have a special bond.
The stag party episode (that's a bachelor's party to you Americans) required a few good man boys. So, Corden decided to get his co-stars from The History Boys to join the party. All the men there co-starred with Corden back in 2006 and in the stage version.
The Jamdani Hash curry Nessa is obsessed with doesn't actually exist. But, a curry house in Wales has set out to create this famous curry, as an ode to Nessa and the rest of the cast. Apparently, the curry has duck in it cooked with honey and lime.
Some of the characters' surnames were taken from very well-known serial killers in the UK. This was done on purpose by the writers. They wanted to give positive connotations back to these surnames, ones like Sutcliffe, Shipman, and West.