When Soundwave's cassettes eject, Cyclonus seems to be larger than Galvatron, due to the misplacement of his animation cel.
Rodimus is missing his spoiler during one overhead shot in the opening battle.
In one shot on Cybertron, Wingcharger can be seen running around in the background. He had been killed before the season began.
Galvatron's purple Decepticon logo turns red when he calls Trypticon.
Unicron's severed head looks as if it was made out of rock. Normally, it is drawn as nothing more than a head.
As Tornedron in the form of a giant bug steps over the bodies of Blades, Slingshot and Wheelie, its glowing aura is on a lower cel than their bodies, making it appear to pass under them, despite the fact they're lying on the ground.
As the Predacons open fire on the Dinobots inside Trypticon, the firing effect of Headstrong's nose-horn is misplaced. He then moves his head to where he is supposed to be shooting from.
When Grimlock says "Me Grimlock not know where I go.", the animation cel of his lower jaw overlaps his upper jaw.
When Headstrong is blown over, he continues bouncing like rubber for the remainder of the shot.
The Oracle mistakingly calls Sludge "Sweep".