I moved my current state from a neighboring one almost two years ago.
About one year after moving I get a piece of mail from my old county's municipal Court. Unpaid parking tickets. I'm like, uhhh what?? As I'm looking it over, not one but two of my previously owned cars had unpaid parking tickets and the DMV still showed them both registered to me! One of them I had owned over two years prior for a handful of months, but was a bad luck car (got stolen first week I had it, then returned then broken into and/or vandalized almost daily for months then parts of it just started literally falling off...like the rear view mirror just fell off while I was driving one day, then the plastic arm on the steering column, which turned the headlights on broke so I had to hold it still while driving so my lights stayed on).
Anyway, both cars had been sold to local auto sales companies, and apparently re-sold without the registration ever being updated--I am not sure how that even happens...and with not one but two cars in the same time period. I had to contact the DMV and fax the court a bunch of paperwork from my insurance company, since I didn't have the bills of sale/receipts for selling them.
I've since learned there is a paper one is supposed to complete and submit to the DMV when you sell your car--a release of liability. In my current state it costs $3.50 to file, and flags the car in the DMV file as no longer registered or owned by you. I just got a new-to-me car, and will be selling my old one for junk next week and you betcha I'll be completing and submitting that form!!!
(Ugh off topic, but there's now a pop-up video ad at the bottom of WS pages which randomly opens and plays then closes, and it moves the entire window around when doing so, so I'm typing and all of sudden the page moves. It's super freaking annoying!!!)