Who's Responsible For What In Home Construction?

Currently finished quotes for my new home build. Talked to four framers to try and find the best mixture of quality and price. One of the framers called to see how I felt about the price and I told him that we had decided to go with a different crew. The framer we picked beat this framers price by about $8k. When I told the guy this he asked what all the framer was doing? I told him all the rough framing except for the windows and exterior doors. He stated his price included those items as well as house wrap, roof felt, and ice and water shield in all valley's. I don't know of rough framers doing roof felt and valley flashing (these items were priced on my roofing quote by my roofer as well). Is this common for framers to do? He also asked if the framer was going to install the rake and fascia? I thought that was part of the guys doing the siding responsibility?

All that to say after talking with this guy he has me questioning who does what and I'm just looking for clarification.