well, I just went and looked at my head(its 98 DOHC neon head, not the head in my car...but I have it sitting on a bench right now) the 2 plugs at the end of the head(on the tranny side of the engine) are threaded as are the two on the back of the head, although some some reason that diagram only shows one going to the back of the head, there are 2...both oil, now the 2 on the timing belt side of the head are not threaded and are freeze plugs, now as far as oil gallery plugs for the block...there are none, there are however 4(I think) freeze plugs for the water jacket

p.s. i did look at my old 2.4L block and there is 1 oil gallery plug for the block(the other end of the oil galley leads to the oil pump) as well, it looks to be slightly bigger than the ones on the head