The main problem our team had to face was cold weather. we had to shoot from 9am to 3pm, outside, and it was cold and freezing. And, when a Russian tells you it was colds, it is REALLY cold.  However, our will to shoot a great opening sequence was so strong that we've overthrown the cold, and continued filming for almost 6 hours.

We had lots of fun during the process of filming and enjoyed every moment of it.
The most glorious moment of the shoot was when Matt allowed us to use his Harvey Davidson motorcycle, which was enormously cool and had a violent scull on its corpus.