OK, so I am already watching season 01 episode 05 of Bloody Monday, and they tried to stick to the manga version but there are characters, places and events that really was changed, probably they had to.
2 things I noticed that they changed, BIG TIME, is one: Falcon’s Father being a part of the terrorist, and second: His second, is not always aware of the situation. Only in the latter part that his “second” became a part of his plan.
Again, I prefer the manga version. I will give more updates as I watch the rest of the episodes for season 1.