In France there are some mistakes that became social markers.

People following conspiracy theories are mostly bad educated people, and they wrongly conjugate some verbs.

The most common examples are:

• “Nous sachons”, instead of “Nous savons” (we know)
• “Ils croivent” instead of “Ils croient” (they think, they believe)
• “Comme même” instead of “Quand même” (nonetheless, despite, kinda hard to translate)

Making one of those mistakes will immediately tag you as a fool.

Even though, only the winning side would draft the “official” version of the events. The “real” “truth” would appear only decades later, when everyone involved is dead (or almost) and independant research can happen. E.g. a former French “résistant” recently confessed his group summarily executed a bunch of captured German Soldier in 1944. Some of the members went in politics afterwards, preventing any investigation to take place.