Good ones mentioned above.
One I was thinking of I will call "The Meeting Code"
JWs are under enormous pressure to attend each and every meeting. Including the ones for field service.
You can make zero advancement unless you follow this rule.
But when the Org decided to do away with midweek book studies it was gone in a "poof".
Just like that, everyone got their Tuesdays back and were still a good Christian. How could that be? How scriptural was it in the first place?
What does that say about all the other mandatory meetings?