I had to go through this with my MG. The owner had neglected to file a certificate of non-operation about 6 years before, and had just decided to stop paying the registration. I had to prove that the car had been stored all that time and that it had been transported out of state on a trailer (not a dolly, its wheels wheels could not have touched precious California asphalt) in order to avoid paying 6 years of registration fees to get my hands on the title. This involved an affadavit by the owner, proof of transport and I don't recall what else. The folks at the DMV weren't sure I could pull it off, but by sending the right forms in along with payment I was able to make it happen.
Later, after my name was in the system as the owner of the car, I received a bill for a parking ticket the car had received between the time I bought it and it was shipped out of state. Of course, this would have screwed the whole thing if California had been in contact with California, as it proved the car had been on the street overnight. Since the infraction took place after the date on the bill of sale (by about 6 hours), it was my responsibility. Sigh. At least it was only $22.