The last A319 I was on had the most yellowed interior lighting I think I have ever seen on an aircraft. Reminded me of the nicotine-stained pubs of yesteryear. Not pleasant at all. Whereas the A321s last week were nicely white.
However, the more modern A31x/2x aircraft have the annoying overhead light switches, which seem to make their own mind up when to actually illuminate after pressing the switch. By the time the light comes on, you think you haven't pressed it correctly, so you press it again, only to switch the damn thing off. Grrr.
And britbronco22, I was on a FULL A321 in both directions to/from OSL last week (something to do with an assortment of concerts going on there). Some very disgruntled late-arriving pax struggling to find space for their wheelie-bags. Oh how I laughed inside..