Rabbits foot may be right. Oil splatter from an oil change would be beneath the oil filter and on the sub frame. However, if it is all "over that side of the engine" as you state in your post, then it is a head gasket leak or the VTEC syl gasket is leaking. These leaks would cause an "all over that side of the engine" leak.
Giving it a quick scrub would help as you can see where any new oil splatter originates.
Good luck and keep us posted...