2008 Subaru Impreza Replacement problems.

So, my boyfriend and I decided to replace my cars rotos and break pads, not a very hard task. So we got them all done except for my front passenger rotor we couldn't get the bolts off to remove the rotor, so we eventually gave up, and put everything back. Not that side makes some very interesting noises, and we can't find anything wrong. Any ideas on what this might be?