Back on topic ... C3PX, you have no idea how dumb training videos can be. I can totally see some Moff decreeing that his Systems Army of conscripts and leftover clones needs some education and getting the Imperial equivalent of Children's Television Workshop to produce it.
According to Lucasfilm's canon policy, every element of the Holiday Special that does not contradict higher canon is in continuity. That includes Itchy, Lumpy, Life Day, etc; but probably excludes the Boba Fett cartoon, since that contradicts the filmic characterization of the Rebel Alliance as a secretive organization. Bast's survival is in question. I would argue that the canon policy only applies to Lucasfilm writers and that each and every fan can enjoy their personal continuity, free of corporate policy, but lots of fans are devoted to the "real" story according to whatever Lucasfilm is wearing this season.