The story of the real life Roman General Corbulo himself: A valiant warrior hero whose suicide at the Emperor's command represents ultimate loyalty (as General Black would have everyone believe), or a tragic victim of corrupt politics and Emperor Nero's paranoia?
In-Universe: Lasky views himself as a conscientious objector. The others view him as a cadet who is refusing to acknowledge his duty.
The use of propaganda by the academy and students is subtle and effective. They're given rousing speeches laid thick with military history (see General Corbulo above), the ceilings of their bunk beds are engraved in patriotic slogans inches from their faces, and whenever Lasky has a contrarian thought about the Insurrectionists the only response he gets is "Why don't you hate them? You should." The interpretation here is either the movie is campy Mildly Military or brilliant in its message.
Critical Research Failure: The script writers clearly didn't understand how an actual Military School works. General Black's constant involvement with and treatment of a group of freshmen cadets is the most egregious example. Colonel Mehaffy's (non) reaction to the fight is a close second since fighting between students is considered a serious offense, and is often grounds for suspension or dismissal.
Uncanny Valley: Spartans without their helmets fall into this. This was likely intentional, since they've been trained and augmented so far beyond human potential. This comprises having faces too-youthful for their size (the youthful faces are right for their age, the size of the bodies on which those faces rest is what is unnatural), too-pale skin (from having spent most of their time in armor), and otherworldly eyes (due to their ocular augmentations.)
Visual Effects of Awesome: For a web series, it has really good special effects with weapons and the Covenant. Microsoft really put a lot of money into Halo 4, and the marketing budget had to go big too. Understandably, Forward Unto Dawn got a lot of good backing driving those effects.