Episode One - S1-E1
Revealing mistake: When Gavin and Stacey meet, look at the people all around them in Leicester Square - many of them are stood watching the filming.
Episode Two - S2-E2
Revealing mistake: When Pam opens the door to Gavin Mick Bryn and smithy after smithy went to the driving range you can see 2 Welsh dragons on the mural behind Pam. Even though Pam and Mick's house is filmed in Wales they live in Essex in the show, in England.
