Factual error: When everyone went up in the hot air balloon the sun and the moon are both visible. The illuminated side of the moon is facing in the wrong/other direction from the sun, which doesn't work.
Continuity mistake: When Peppa talks about her parents getting a Playgroup Star, the picture that Peppa made has a white background. When Peppa asks Daddy Pig if he did get a Playgroup Star or not, the picture that Peppa made now has a blue background. (00:00:49 - 00:01:11)