Validation Errors from Plugins

Hi! I cleaned up most of the errors for my development site, but the last few are for plugins I am using. Any ideas how to fix these?

Here’s the list:

Line 64, column 63: document type does not allow element “meta” here

<meta name=”generator” content=”Cart66 Professional 1.5.0.4″ />

Line 65, column 8: document type does not allow element “script” here

<script>function cb_pinterest_plugin_load() {

Line 122, column 184: document type does not allow element “link” here

…nt/plugins/gravityforms/css/forms.css?ver=3.4.2′ type=’text/css’ media=’all’ />

Line 65, column 8: required attribute “type” not specified

<script>function cb_pinterest_plugin_load() {

Line 77, column 7: end tag for “style” omitted, but OMITTAG NO was specified

</head>