When Homer, Bart, Maggie and Lisa are playing soccer in the backyard, Ronaldo can be seen standing behind the dog house wearing the official team jersey of Brazil's national soccer team. Ten seconds later, he is seen wearing the generic white jersey he wore earlier.
When Homer, Bart, Maggie and Lisa are playing soccer in the backyard, Marge can be seen sitting parallel to the kitchen window on her computer. Later on when Lisa asks Marge if she would like to come out and play, Marge is now sitting perpendicular, facing the window.
Moe is shown as a player in the online game throughout the episode, but Moe is also shown as being kept bound and gagged by an imposter.
Bart being 10 years old would never be allowed to play an MMORPG as most online role playing games require those to be 13 to play.
Apu is seen eating Skinner's body (as a chicken) despite him being vegetarian.