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Here's one I've not seen mentioned yet, and if it has my apologies for the repetition: WWI Home Defence squadrons in England did not historically fly sorties as flights but rather as solo patrols, each assigned a section of the 'grid' for that particular mission. As it is now they go up in flights of three or more and fly together, which is quite wrong. As the devs are always striving for historical accuracy this is something that should be addressed in a future update.
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I'd like to second Lou's point. I haven't done Home Defence yet, but flying as solo patrols would be quite important to the immersion. It's especially important at night.
