Jimf, the L2 has large windows front and back, and the central jettisonable doors. That just leaves 1 pair of windows towards the front, and 1 pair at the back, that are the smaller variety.
However, in an event such as we have just seen, its probably too difficult to jettison the main cabin doors, and pax will use the smaller door windows instead. I think there is scope for making door jettison easier in extremis, or even automatic, but of course one always has to guard against inadvertent deployment.