Broken Base: Alot of people are divided on the quality of Yu-Gi-Oh GX Abridged since ShadyVox left to persue his music career, some think it's still good, some don't but think Xthedarkone just needs time to find his voice on his own and some have given up entirely on the series. Specifically, this was sparked by episode 19, his take on a much-maligned filler episode of the original series, which barely parodies the episode and instead spends 2/3 of the video on either commentary or a mock trailer for the next one.
Critical Research Failure: Syrus activates a Trap from his hand using Jetroid's effect, while facing an Ancient Gear Golem. Jaden insists that this is bull, but Syrus tells him to read the rules. In reality, Jaden is right - a (possibly now unofficial) ruling states that in this exact situation, Ancient Gear Golem would prevent the Trap from being activated.
Creator's Pet: Syrus. It's later revealed that xthedarkone likes Syrus more as the protagonist and he doesn't like Jaden that much.
Win Back the Crowd: Episode 20 offered a much tighter, funnier script than what came before, xJerry64x giving a better performance of Jaden than before and Purple Eyes WTF as Ojama Yellow, AND Shadyvox returning! Worth the wait indeed.
Author's Saving Throw: In regards to the development of the series itself, as well as the plot holes it covered from the original...
As seen in Growing the Beard, the low-quality dub footage was replaced with much higher quality footage from the Japanese raws, and the editing and effects improved drastically.
Jaden suddenly trying to duel seriously against Zane is given a bit more plausible explanation with the context of their Abridged personalities: Zane insulted Jaden in his offer for a duel, mocking his tendency to cheat his way to victory, which spurred Jaden to study actual dueling in order to spite him.
The series does a much clearer job of Foreshadowing Jaden being the Supreme King, explicitly revealing that his power to "cheat" is exactly that, helped by his eyes turning a clear shade of gold in situations where he's legitimately pushed to his physical and emotional limits.
Growing the Beard: The footage that was used was originally ripped from low-quality dubs, and the humor was what one might expect from an early Abridged Series. Come the second half of the Seven Stars arc however, and the quality of the footage increased by using raw footage of the Japanese version, while also making more consistent characterization in the process, even using elements from the original series, which also boosted the quality of the jokes as well.