The name 'Imperial Super Commandos' was one of the earliest concepts associated with Boba Fett during the development of Star Wars: Episode V - The Empire Strikes Back (1980). Instead of a bounty hunter Fett would have been part of a class of Super Stormtroopers with all white armor.
Gar Saxon made his debut in the canon Dark Horse comic "Darth Maul: Son of Dathomir", which was based off of unproduced scripts for The Clone Wars TV series.
Sabine and Fenn Rau play a Mandalorian game loosely based on "Cu'bikad" from Karen Traviss' Republic Commando novels. Some of the production team referred to the game as seen in Rebels as 'Stabble'.
The Phantom II, formerly a Neimoidian shuttle, has artwork of a Tibidee from Rise of the Old Masters (2014) on it's center wing.
The Aurebesh text visible on the Probe Droid's view screen translates to "playback".