Corrected entry: For some reason, the image of Trigon in Raven's mind does not have the antlers which are featured on the real Trigon in the 4th season and in the comics. I think that Raven should remember her dead father well enough to remember that detail, minor as it seems.
Corrected entry: At the beginning of the show, all five team members working together are unable to defeat Cinderblock, yet somehow Cyborg is able to return later on and show the team he defeated Cinderblock by himself.
Correction: Trigon can disguise himself. He appeared to Raven's mother as a handsome man in order to marry her. He could very well have (understandably) not shown his antlers around his daughter, to make himself appear less evil. There is no mistake.