Episode One - S1-E1
Visible crew/equipment: The shadow of the camera falls across the table as it moves towards Stacey when she is on the phone to Nessa asking her if she wants an omelette.
Episode Two - S3-E2
Visible crew/equipment: When Gavin turns up to Nessa and Dave's caravan and says "hiya," two cameramen are reflected in the car as he moves round it after closing the door.
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.
Trivia: The three main families in the show are named after British serial killers (West, Sutcliffe and Shipman).