Trademarking an address
I would take issue with the PTO explanation on a trademarking an address in "that a street address really only conveys a physical address and nothing bigger". "1 Park Lane" may be part of an identification of a physical location, but every city could have a "1 Park Lane" and only one of them should be able to get a trademark. Domain names aren't like that.
While I can understand Booking.com wanting a trademark so that they could go after people who are using their name in trade and implying endorsement without their permission - what happens when someone trademarks a domain but then lets the domain expire. Should the next person who registers it be unable to use it because the previous owner trademarked it, even though the mark holder no longer owns it?