Easy and quick interview process, but did not inform me of certain things that the interview required, process as a whole was easy and they hired me after some communication on the matter that was not brought to my attention

I didn't go their class and passed the Tax Knowledge Assessment on the website and then applied online. I got a call on the next day to set up an on-site interview in the following Monday. After the interview, I got the offer when I walked out of the office. It was so efficient and I really appreciate it! I was relaxed in the whole interview and before that, I really feared about the interview because English is not my mother language. There is just one simple question "tell me about yourself", I answered a lot, maybe the interviewer figured out that all the things he wanted to know were in my introduction already, so no more formal questions. And still I remember someone said in his review that the interview in this company was really easy, especially in the DC offices. Yeah, I bet he is right.