I hand-waved Glenn's non-Lexus car as in the same category as why he didn't have an assistant. Maybe he also thought the car would come out of his salary? To me, this says he and his wife are pretty thrifty and probably have a decent bit saved.
In the end, a Lexus is just a jacked-up Toyota.
The salary error I can also wave off. At my job, one year I had a bad performance review. HR decided to cut my salary by 10%. I wasn't really happy about this, but what was I going to do? It was to start in January. By that next September, it had not been implemented. Finally, it went into effect in late-October. I was not asked to pay the back cut.