This was one of the weirdest experiences I had in going from seeing the car in a Design Studio to owning the car. We visited two Design Studios a total of five times to check out the Air during our long wait for the car. On every visit, I found the roof rails a real hindrance to ingress and egress and to reaching out to pull the doors closed, bumping my head an embarrassing number of times. I'm short (5'7") and almost got to the point of canceling my reservation over the issue, thinking this would be an ongoing issue for me and any other adult passengers.
Then the car was finally delivered. Within a couple of days I was getting in and out with complete ease, never giving it a thought. All I can figure out is that motor memory for how to enter and exit without hitting the rails developed quickly under regular use of the car. What is more mysterious is that taller friends who ride in the car less frequently have never noted any difficulty, either on their own initiative or in response to my questions about it.
I have also watched innumerable video reviews of the car. Only once did I ever see anyone comment on difficulty in getting in or out. In fact, Sandy Munro, in his first examination of the car, actually raved about how easy it was to get in and out of the back seat and commented that Tesla ought to take that page from the Lucid playbook.