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1) Regenerate critical CSS in hummingbird automatically when migrating from staging to production.
Currently even database find/replace, static cache, object cache, and hummingbird’s deceptively titled “Clear all cache” commands don’t do the trick to fix background image URLs in that critical path CSS. Please make “Clear all cache” regenerate critical CSS, and trigger this command automatically when going live from staging.
2) Run a DB update automatically when migrating from production to staging. It’s a VERY safe assumption that you can change all instances of your staging URL to the production URL. (BSR finds hundreds of staging URLs every time I do this)