An american girl in paris (part deux) - S6-E20
Continuity mistake: In the first shot of the diner as the girls are waiting for Carrie to arrive, the baby photo of Charlotte's daughter is not visible on the table. When Carrie comes in, there is a clear shot of the entire table, and the baby photo is still nowhere in sight. But in the shot where Carrie sits down at the table with the girls, the baby photo is suddenly sitting upright on the table near Charlotte, and fully visible. There was no time for this to happen, as they are just sitting down. Carrie is still hugging her friends (Charlotte) at the table. (00:41:40)