Sometime it is better not to pay too much attention to some lyrics on pop song. But Mark being a writer even its simpler ones can reveal some surprise.
"Don't You Get It"
"Oh, 'Don't You Get It' is really, it's not about, even though it says 'Don't you get it, I don't want to buy your car,' it's not about a car. It's just the idea about buying an idea, it's the idea of not wanting to go your way but wanting to go my way, and it just applies to so many things, you know. If the record company wants you to do something or other and you say 'No, I don't want to do that, I want to do it this way.' And really, you could apply it to anything that you want, I think it's important to be able to please yourself because I think if you can't please yourself then you can't please anybody."
source :
Golden Heart press kitI don't care about the lyrics and I like the song.