Doug Fredericks shot some really good ones at the recent ILCA Midwinters West

International Sailing Academy, an advanced Laser coaching school (by "advanced" I mean Olympic-level). They have videos on their private Discord channel. However, a subscription is needed; it costs $19/month. I'd encourage anyone who umpires Laser regattas to subscribe, since sailors are regularly uploading GoPro videos of themselves sailing downwind in waves. While the coaches provide their guidance on what they deem to be in-bounds for Rule 42, it'd be great to get umpire perspectives as well.

https://learn.internationalsailingacademy.com/

(I don't work for them; just a happy customer.)

Re: ISA....in some cases, the actions they coach exceed what I see is acceptable within RRS 42.  However, whenever I do a RRS42 workshop with our club team, the first thing I say is that if you haven't been yellow flagged, you're not working the boat hard enough. A coaches job and perspective should be different from mine.

Greg, that's exactly why an umpire's perspective would be welcome. Checks and balances. 

I had a whole 42 presentation that got lost when a computer crashed but may have some of the videos I could put in a Dropbox when I get home next week
Doc

There are a couple websites that I have used for refreshing myself on rule 42 actions.  One is from Scuttlebutt site showing Finn, a bit basic, but useful:  
https://www.sailingscuttlebutt.com/2017/10/13/video-common-breaches-rule-42/
The Finn class has good videos on their website, these are from real races with judges making the calls:
https://www.finnclass.org/racing/learn/rule-42-videos
Hope this helps.
tom.

Ezio Fonda compiled a lot of videos he took/found on this online presentation (kindly translated from Italian into English by Andrew Alberti):
https://docs.google.com/presentation/d/1S7Hb8vHlqJbai-YGA52UXHrd_NPywNkC/edit#slide=id.p2

Enjoy, and thanks again Ezio!!