#3 Both teams played 3-4-2-1
In a day & age where 3 at the back seems to be the new thing, it was no surprise to see both North London clubs line-up in a 3-4-2-1. This meant that both teams went man for man with each other, meaning the work rate of the players & implementation of the system would provide the only difference.
For the first 45 minutes, both teams got accustomed to the lack of space and time on the ball, as they tactically cancelled each other out for the first half.
Once Pochettino sussed out the man for man dynamics, he instructed his players to go out wide, thus stretching play at every opportunity. This forced Arsenal players to commit outside of their delegated zones, meaning spaces began to appear, which Spurs subsequently exposed.
The 2-0 result shows that one manager was able to flexibly adjust to a situation, while the other stayed stuck in his ways.