Remember if you use 'go potty' outside to get them to go, don't use it inside.
We had a 2 yr old lab and would ask if he had to go potty, not realizing we were telling the new lab puppy go potty outside. Caused lots of stress and I thought she would never get it. Once we fixed that things went a lot better. :)
Also limiting the water at night helped too. We also did the bell on the door before going out and she picked that up in a day or two.