Just a very minor snippet.
As we saw from the recent press release for Episode 4.09 - The Shape of Things to Come we see that a character called Doug appears. Doug is played by the actor Sean Douglas Hoban. There has been a bit of speculation about Doug as Sean also works as stand-in and stunt double for Dominic Monaghan.
I can confirm that his appearance is actually that of his "redshirt" character and he actually gets to speak some lines as opposed to being a Charlie stand-in.
Let's just hope that, unlike Star Trek redshirts, he might just survive this episode.