Having a Chinese mobile number is more than useful: you definitely need it.
And while the bank may or may not want a lodging registration slip, they will want a Chinese address, so take a card from the hotel.
Be prepared to provide your home country address and tax ID number.
Remember that if you lose your ATM card or need other help, you'll usually have to head back to the same city maybe even the same branch.
Don't complicate this with overseas transfers. Just get RMB cash and deposit it. (Again, making further cash deposits out of the area where you opened the account may be awkward.)
Finally, since opening an account is discretionary, if your Chinese is not up to par bring a Chinese speaker along. You don't want the staff to think that dealing with you will be a hassle.