Layout, location, finish choices.
Choice of sub contractors (drywall, trim work, PAINT, landscaping). Also concrete work could be better. Not happy about crack in the patio slab that ran the entire length. We also had some concerns regarding quality control during the process and we met with the Production Manager(Jim). It was a very disappointing experience. He was dismissive and rude. Thankfully our Project Manager Frank was there.
The floor plan
Change the contractor, put more pressure on them to ensure things are level.