You know what I hate about Gallery? It breaks the Back button. For example, go here. Then select page 2 (right above the date). Then hit the Back button. You would expect that you would go back to page 1, right? Nope, you're left staring at page 2 wondering why the Back button didn't work.
(Note: For the same reason that this is broken, going here might take you directly to page 2. If that's the case, select page 1 then hit the Back button.)
This is, of course, just one of the many things I hate about Gallery.