During the montage scene of the episode the boys are seen playing World of Warcraft in school. During the back shot of the boys; they are overweight. However, when it cuts to the front of the characters you can see that they are at their normal weight.
At the end of the episode, the Blizzard Exec's are looking for a character named "LovesToSpooge", which is Stan's character, according to his Dad. In the beginning of the episode, Stan's character's name appears as "Staniscool" on his monitor.
When the crew begins to attempt the hardcore leveling there's a scene showing Ike refueling Kyle, behind them is a calendar with half of October blocked out, however, in the next progression montage the calendar flips day by day showing September.
When the Blizzard developers discover that the griefer has killed every single player in the Arathi Highlands, it is clearly nighttime outside. But when the man in the "Dwarf Needs Food" t-shirt despairs over the possible end of the world (of Warcraft), it has suddenly become daytime.
At 1:15, Randy says to Stan "You've been on your computer all weekend!" Except Stan is not on his own computer... He's on Randy's computer in Randy's office.
The boys level up to 60 fighting nothing but low level boars. This is not possible as after a certain level those boar will no longer grant XP.
Stan's dad claims his character is a Hunter, but his character's race is clearly Human. The Hunter class is not available to Humans.
Stan's character, who is a Human warrior, is clearly wearing a Frostwolf Battle Tabard. This is a Horde only item and is unobtainable by any Alliance race.
During the leveling boar killing montage, when Stan's warrior increases in level it flashes on screen 'XP:142' gained, however this wouldn't be possible if the boars were only worth 2 experience each as Cartman earlier stated.
They continue the montage even after their players reach the level cap (60).
Cartman's Character is a Dwarf Warrior, however his UI and spells are that of a Rogue's.
Kenny's character is a Human Hunter, an impossible combo.
(At 2:33 and 9:05) Randy's degree from the University of Denver is hanging on the wall behind Stan, but it mistakenly displays Stan's name rather than Randy's.
When the boys first decide to confront the griefer, Cartman says they will all meet together on the plains of the Elwynn Forest, near Westfall. However, when they are all assembled they are located in the Alterac Mountain region beside the Lordamere Internment Camp, at least 4 regions away from the Elwynn Forest.
Stan's father mentions that his level 2 hunter has just joined a big party of Night Elves and they're going to explore the Tower of Azora. The Tower of Azora isn't a dungeon and contains no monsters or instances; only vendors. "Exploring" it would take about 30 seconds. Also, the Night Elves' starting area is on the other side of the world from the Elwynn Forest where the tower is located. Any Night Elf character in the forest would most likely be of a much higher level than Valcorn in order to have traveled there. This makes it unlikely that a "big party" of them would join with a level 2 hunter in order to explore a tower containing only a few item vendors.
At the beginning of the episode, Cartman asks where the rest of his party is. They reply that they are by the cart. However, the cart in Goldshire is clearly visible in the background with the characters no where in sight. Cartman is, in fact, walking past the cart as he is speaking and the rest of the boy's characters are further down the road.