Hi,
These are two different issues. Well, actually three.
There are two issues in mirror due to the fact that the OS is picking the wrong GPU to both render content and to decide what to put on the screen.
These issues were introduced in El Capitan and I'm confident we'll have a workaround for those in the next release.
The Mission Control issue is an older one, I'm not yet sure what triggers it but it's clearly an OS rendering issue: you can notice that the screen shot has the same issue, meaning that the corruption is what has been rendered.
I'm not aware of workarounds for this issue.
As you'd expect, we have bugs open with Apple about all these issues. You are welcome to increase the priority of these issues by logging them in bugreporter.apple.com
Best regards,
Carlo
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