The 2 door car thing was not a hard and fast rule. Depending on the conservativeness of your area or body of elders, it might not have even been mentioned. It was "suggested" from time to time that 4 door cars were better suited for service and that everything we do is in service to Jehovah so therefore..... but it was never enforced. In fact, as a teenager and young adult, I never owned a 4 door car. I owned several muscle cars and occasionally an over zealous elder would say something snide about it, but I was not black-listed or removed from being an MS for owning them.
Some areas had more weird ideas than others. Like the pepperoni thing. I've never heard of that. There is no stigma attached to eating pepperoni in the areas that I spent time in as JW for over 30 years. But get one weirdo elder who imposes his personal opinion or practice on the friends and the next thing you know everybody thinks that it's some new "rule" from the WTS.
In fact a lot of "rules" that we remember aren't "rules". A "suggestion" or "what some christians have done" might have been mentioned on stage by an elder or CO, maybe even from the convention, but it wasn't a "rule". Over zealous and obnozious elders may have overstepped their bounds in these areas aslo. But the guilt that we felt because of how "suggestions" were conveyed compelled us to follow suggestions as rules.