In typical Arsenal fashion, they made things much more difficult than they needed to be. The Seagulls put in a spirited performance, and after Olivier Giroud's sumptuous curled opener, atrocious goalkeeping from Wojciech Szczesny allowed Brighton to get back on level terms.
Giroud then got a second in the 56th minute when a lovely pass from Abou Diaby over the top of Brighton's defense allowed him to smash past backup goalkeeper Casper Ankergren. But Leonardo Ulloa took advantage of awful Arsenal defending to level the score again six minutes later.
After some very open play in the ensuing minutes, Arsenal got the break they needed. A corner was cleared into the path of Theo Walcott just outside the box, and his first-time shot careened off a defender and into the back of the net.
Let's look at six things we learned from a frenetic fixture.