Conversation so far:
What was the difference between the UK and US Extra TV series?
There were some subtle changes between the UK and US versions, with references to the names of British celebrities often being changed to American celebrities for the US edition.
What were some other differences between the UK and Us Extra TV series?
In series 2, episode 1, Keith Chegwin's anti-gay tirade. The scene had to be rewritten for the US as the original lines did not translate well.
Were there any other differences between the UK and Us Extra TV series?
In series 2, episode 4, Moira Stuart was completely excised from the US version and a song by Coldplay frontman Chris Martin replaced it.
Why were there differences between the UK and US Extra TV series?
Some cultural references did not translate well for the demographic the show was being presented to.
Are there any other interesting aspects of this article?
Each episode has at least one guest star: a television or film celebrity, who play what Gervais and Merchant have referred to as twisted versions of themselves.

Question: Did people notice the differences?
Self-contained rewrite: Did people notice the differences between the UK and US Extra TV series?