Trivia
In the final episode of series 6, you can see the brand name on the crisp packet that kills Kelly. It is Nickson's - named after Susan Nickson, who created the series. See more...
Movie Mistakes blog
Popular blog posts:
Top 15 biggest Harry Potter film mistakes
The 10 biggest mistakes in Iron Man 1 & 2
15 biggest mistakes in Titanic
Other great sites
I'm afraid there aren't any mistakes listed for series 3.