The troopers of the 501st surprise Ahsoka with helmets decorated orange in her image. Rex is seen holding one of these helmets in his arms. But during the mission to Mandalore, Rex wears his regular white and blue helmet instead.
The beginning monologue characterizes General Grievous as a droid when he is actually a cyborg.
Although all the troopers of the 501st are meant to have hand-painted Ahsoka's visage on their helmets, the paint patterns are all identical, down to the rough edges, missed spots, visible brush strokes, etc.