#1 Lack of creativity in the final third
While Spurs really didn't get a chance to express themselves in the first half, they failed to respond in the second one in which Arsenal were happy to sit back and switch to a simpler counter-attacking style.
It seemed like Spurs' midfield was having a bad day at the office, as all of the creative forces combined were able to produce just 5 key passes in the whole game including one from a corner. This is very unlike Spurs as they have one of the strongest midfield lineups in the Premier League, featuring the likes of Christian Eriksen and Delle Alli.
Due to this lack of creativity, Tottenham had to take the desperate route yet again and go for wasteful shots, which are clearly represented in the graphic below, which shows that Spurs managed to put just 4 of their 14 shots on target.
Even though Arsenal also have a similar shots-on-target to total shots ratio, they have an excuse as many of their shots were blocked and they managed to score from both of their first two shots on target.