return Redirect::to('users/register')->with('message', 'The following errors occurred')->withErrors($validator)->withInput();
Further, you can print them as:
@if(Session::has('message'))
<p class="alert">{!! Session::get('message') !!}</p>
@foreach($errors->all() as $error)
<p>{!! $error !!}</p>
@endforeach
@endif