Who said Joomla template must be the same on every page?
Not Joomla! CMS, that’s for sure! You can use one template with different properties to chosen (sub)pages provided that your Joomla 3.x template includes configuration options which allow to create multiple different styles of a template with variations of these options.
Before you start to modify a Joomla 3.x template's CSS styles, you need to consider which method is the optimal solution for your project.
The most important is fact that we release Joomla 3.x template updates quite frequently, so you should take into account that you may need to update your template files in the future.
After clean Joomla or quickstart installation there may occur that subpages don't work properly and you keep getting "no input file specified" or "404 - component not found" error messages on front-end while navigating a menu.
This issue is related to the server configuration and has nothing to do with Joomla 3.x/2.5 or quickstart package.
Customers often check demo site of templates they would like to buy on their mobile device.
Sometmes they are confused since it occure that the template that is marked as optimized for mobile devices does not appear correctly - I mean like being not responsive what is not true.
After updating Joomla to 3.1.4 version your site may give 500 error or display the following error message that relates to EF3 Framework plugin for Joomla 3.x