Ampersands in URLs not working with HTML5 validator

All the errors for this page are un-escaped ampersands in URLs, which  
shouldn't trigger an error.

http://validator.w3.org/check?uri=http%3A%2F%2Fifteapotscouldtalk.com&charset=%28detect+automatically%29&doctype=Inline&group=0

NOTE: Whenever possible, give the address of the document you were  
checking.

Hope this helps,
Chris