Character mistake: In the final show, when Nesa and Smithy are getting married, Smith states his name as Niel Noel Edmund Smith, but that is actually his son's name, a.k.a. Niel the baby.
Gavin & Stacey (2007)
1 character mistake in show generally
Starring: Mathew Horne, Ruth Jones, Alison Steadman, Joanna Page
Episode Six - S1-E6
Other mistake: After the wedding when everyone is outside, Smithy says he has forgotten the maps that gave directions to the reception. Bryan says he can use the sat nav in his Picasso and tells everyone to follow him. But he was driven to the church in the Bentley with Stacey, so his car wouldn't have been there.
Trivia: The three main families in the show are named after British serial killers (West, Sutcliffe and Shipman).