The Thin White Line (1) - S3-E1
Continuity mistake: When Brian finds Peter in the rehab centre, he has 7 beers in a pack on the bed beside him in a row of 4 and a row of 3. When the camera changes, the row of 4 which is on the outside has been reduced to 3 cans. The direction on which they are facing also changes from across the bed side to side to along the bed top to bottom. (00:16:35)