Where do i unlock the Pedestal for the extras is it in with the boss dragon?
No. It should be enough to cycle through the dialogue till you get the message about the voices having stopped. Once that happens, beating the boss and skipping the end credits should do the trick.
It's always possible though that I've goofed with the code and it's not working properly in all situations. But I couldn't produce any issues with the Extras unlock myself while testing it out.
I should probably mention, that closing the game reverts everything back to default since it doesn't store any of the data in any outside files for later. So if you close the game and restart it, you'd naturally not have the menu either.