WordPress Queries Not Working?

For the sidebar bit, you should be using a new Wp_Query:

if ( $query->is_category('movies') ):
    $movies = new Wp_Query('tag=movie-reviews');

    while ( $movies->have_posts() ) :
        $movies->the_post();
        get_template_part( 'sidebar-reviews', get_post_format() );
    endwhile;

    else:
        get_template_part( 'no-results', 'index' );
endif;

You don’t need query filters for anything except the main loop on a page.

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