The skeleton found in the crashed shuttle has long incisors and wears a spacesuit similar to Jaxxon, the much derided alien 'green rabbit' character who appeared in early Star Wars Marvel comics in the seventies.
A Sunny Day in the Void is George Lucas's favorite episode of Star Wars: The Clone Wars.
The 'Jedi fortune cookie' message that opens the show reads "When all seems hopeless, a true hero gives hope."
The opening titles before all episodes in this four-part arc (Secret Weapons (2012), A Sunny Day in the Void (2012), Missing in Action (2013), and Point of No Return (2013)) are blue rather than the traditional yellow.