Odd Jobs on a Movie Set

We took in a Sunday afternoon matinee of True Grit today. Those Coen brothers really know how to catch your attention.

My wife is always curious about even the minor credits, so in addition to multiple odd names for jobs on a movie set like 'gaffers,' and 'best boys' and 'grips', I noticed about 4 or 5 guys that had a job called 'green' as in a noun. I hadn't seen this before so went to Google to look it up. It looks like there are at least two explanations: the obvious one would be those who keep the environmental whackos at bay, but another possible job would be those who 'dress a set' outside with greenery or whatever. It wasn't clear from the context. Perhaps there are other explanations too. I almost forgot another oddity in the minor credits: there were two people listed as 'puppeteers.' Thinking back about the movie I just can't quite imagine what they would have been doing on these sets.

Oh by the way, the movie was pretty good, perhaps even better than the earlier John Wayne effort.