Phone Interview - This was with the Lead Developer on the team. As others have mentioned, the STAR methodology is used heavily. Very few technical questions, and those asked were fairly basic (Describe the MVC pattern, what is viewstate used for, how would you select only 10 rows in SQL Server).
In-Person Interview - Received an invite for in-person interview shortly after phone interview. Before meeting with interviewers, I was greeted by an HR person who took myself and another applicant to a conference room to watch an intro video about GM. Not sure what it was about the HR person, but he wore me out after listening to him for 15-20 minutes. The video was pretty a much a sales pitch for working at GM.
After the video, I was taken into a small room and interviewed 1-on-1 with a hiring manager. Again, behaviorial questions were asked, very few tech questions. Hiring manager didn't seem interested right from the start -- made me think he was going through the motions and already had a candidate selected.
Second interview was with another hiring manager. He asked very similar questions to the first interviewer and also asked about my experience using certain JavaScript frameworks - Durandal, Node, JQuery, etc.
All-in-all, it was a fairly comfortable experience. Didn't feel like I was being "grilled", as is the technique for many other companies hiring developers.