1) Show more lies. When you reach the bottom of the list of more to see (through multiple Show mores), it teases you into thinking there is more to see, but there is not!
2) (in Opera.. I have come to not trust anything display-wise in FF6) with the first Show more, your screen position (location in the list?) is retained, but the 2nd time you use Show more, your position jumps to the top of the screen. This is sometimes buggy as I have seen an accidental highlighting (not selecting) of a large block of interfaces.
3) For a traditional (Node Data/Interface Data/Response Time) set of graphs, Node Data gets a yellow highlight after using Show more the first and subsequent times (for Interface Data Show mores).