I'm a Pennsylvania resident.
In the past, purchasing a titled item from another Pennsylvania resident required that both the seller and buyer be present at the same time to have the signatures notarized.
Now, a Pennsylvania seller can sign the title and have it notarized IF the buyer's name and address are filled in on the title so that a Pennsylvania buyer can do the paperwork at their leisure. They do not have to be present.
When I purchase a vehicle from a seller in another state, I have the seller sign it and I get a bill of sale. The notary is happy with that.
When I sell a vehicle to a seller in another state, I sign the title and give them a bill of sale.
Do not fill out anything but your name as it reads on the title and address unless you know what you are doing. It didn't happen to me, but I knew the party...it took him 3 months to get the title straightened out. The car was impounded in NYC because the title came back as unprocessable or some bullshit. The seller had filled in the actual mileage on the title, but the correct mileage was recorded as "exempt" and the transfer was refused. Fucking bureaucrats.