Brian: Portrait of a Dog - S1-E7
Continuity mistake: At the dog show, Stewie starts to try to get out of his stroller before asking Meg to push him into a lake. The person on the right of the screen as he's struggling is only seen from the calves down, and is wearing blue pants and black shoes. After Meg gets up and says she'll find him a juice box, the people behind Stewie do not match up with this at all. And then in the next close up of him, there are identical legs in the same position as before, but now with black pants and white shoes. (00:06:42)