Apparently the penalty for speeding in the pit lane increases based on how much over the limit you're going, and apparently the stop/go is the suggested penalty for ignoring double waved yellows (this is what I remember from watching Sky's post-race analysis)
Could be me but I didn't see any double yellows for that mirror. If they would have just cleared the mirror away under vsc or sc straight away all of this could have been prevented.
I also heard the Lewis thing was because the SC drove through the pits making speeding a bigger offence. Makes sense, sort of.