They’re relatively minor, but I felt the need to bring them up anyway.
Bastion’s Brick skin doesn’t have his blue head-light and chest-light Lego pieces change to red when using his “Alert! Alert!” emote. Even the Omnic Crisis skin, which already gives him red lights, changes the color when he uses that emote.
His “Tank” victory pose has Ganymede clipping through that second barrel-thing inside of the first. The tip of his head also occasionally goes through the primary barrel.
His “Bullet Rain” highlight intro uses the barrel flashes for normal Bastions, not the Lego flames of Brick Bastion.