Amazon Software Development Engineer, II interview questions

Typical Big5 company interview process. Few calls, online automated tests then a 4 hours with 4 people on-site or on recruitment event. Mostly algorithms and Amazon principles. I'd like to review the after part of the interview, if you get the offer. The offer letter is incorrect stating that you should accept this by the date which is in the past, you notify them, but they say it's okay, leave it. Then when they prepare for you the immigration papers in the last week of moving to Canada, the lawyer will tell you it's not right, then you tell the HR, they don't understand which date and where, when it's clean and not that many dates in a contract. They couldn't change it, you go to the border with invalid data. It's fine. Multiple HR people get laid off or moved to other departments until you get yourself hired. Multiple managers might exchange you from one team to the other, you won't know where you end up. You have no idea what you will work on. If your visa gets late, your team might move on with someone else.