Continuity mistake: Timmy agrees to marry Russell because Timmy's work visa has expired and he will have to leave the country. However, in the season 5 episode "Double Down" Timmy states that he has been a US citizen for many years.
Continuity mistake: When Serena is saying goodbye to Dan, rain is pouring on the angle focusing him, but not on the angle focusing her. This changes back and forth.
Continuity mistake: When Buckingham is about to be arrested, the camera is looking directly at him. At this angle, his black fur collar is flipped up, covering the neck of his white shirt. When the scene changes to a wide shot behind him, the collar is folded down. (00:35:00 - 00:35:50)
Episode One - S2-E1
Continuity mistake: When Gavin and Stacey arrive at Mick and Pam's house in the Saab, the car stays on the drive. A few minutes later, Bryn appears in his Citroen into the same place on the drive and the Saab has moved to the space in front of the house.
Continuity mistake: During the scene where Ned and Chuck are making a pie, Ned picks up the unfinished pie crust off the counter so Chuck can put more flour down. After she sifts the large pile of flour on to the counter, Ned moves to put the crust back down and now it is easily twice the size it was when he picked it up. There is no way for him to have rolled the crust larger off camera because Chuck was in the way and that was the whole reason he picked the crust up.
Continuity mistake: When Violet is talking to the boy outside the school, he is holding a baseball bat. At one point he points the bat at her, but in the next shot the bat is on his shoulder.