Stephanie Plays the Field - S4-E22
Other mistake: It looks like she has earring holes. Didn't she get her ears pierced later on in the series?
The Bald and the Beautiful - S3-E7
Other mistake: At the end of this episode, there is a typo in the credits: "Directed by" is written twice. (00:22:30)
Mystery Tour - S6-E4
Other mistake: When Mrs McAllister reads from the brochure in the horse-drawn cart, it says Warwick Castle on the front.