I places where there are spikes(Such as the Shrine Of Betrayal) if you fight a monster on top of spikes and the monster Critical Hits you then the spikes stay up! They still hurt you and you can walk over them.
BTW; You can slay Fire Traps. <img src="http://i.neoseeker.com/d/icons/wink.gif" border=0 vspace=2 alt="" />
I some specific places in the game (Such as Mt Hades) you can go to the formation of stones;
And push the middle stone left then go to the top left or right stone(Although it's easier on the top right) and press A rapidly (about 3 times) while pressing right(for right block and vice versa) and you go through the block! Although the came corresponds by making the block move right while the graphics sit where they are. If you try to walk right through you will appear under the rock and hit the invisible block but not be able to push it due to the fact this is a glitch.
If you push the bottom right block right then you can walk right through the invisble block too.