Some threads don't have all the posts. A thread with two pages won't show the option for page 2 if you're on page 1, and sometimes the last few posts on a one page thread don't show up.
All this despite the website not being designed any differently (as far as we can tell visually) on mobile.
"The more generous you are with your music, the more it comes back to you." -- Dan Lampinskihttp://www.queenlive.ca