#3 Failure to defend diagonals
Another thing Tottenham failed to do was defend against the constant diagonals that Arsenal bombed against them in the first half.
Arsenal's creative midfielders, namely Ramsey, Ozil and sometimes even Lacazette, were constantly picking out Sanchez and Bellerin in space on their opposite flanks in order to quickly switch the point of play.
Arsenal drew the Tottenham pressure into one half of the pitch and this left a lot of open space for the Arsenal player sneaking through the opposite flank.
This caused the Tottenham defence to panic in order to close down the pace and creativity of Sanchez and Bellerin and led to disorganisation and lack of discipline in the final third from Tottenham's side.
It was through one of these diagonals played into Alexis Sanchez that caused Davinson Sanchez to give away the free kick through which Shkodran Mustafi produced a striker's finish to put the Gunners into the lead.