Continuity mistake: When the spaceship is landing, there are no craters near, but when Scratchy gets out, there are some craters there. (00:00:31)
Continuity mistake: After Scratchy blows up in the movie they're watching, when Homer stands up in the shot facing the audience there are two empty seats behind Homer, between Dr. Hibbert and Marge, who's seated beside Lisa, but in the next shot facing the screen Marge is now seated beside Dr. Hibbert, and there's only one empty seat now between Marge and Lisa. (00:01:20)
Continuity mistake: When Green Day finishes, in one shot the dice on the drums are gone, but the next shot, they are back on the drums. (00:02:50)
Continuity mistake: The "Duff Beer" blimp disappears from the sky while "Green Day" are performing. (00:03:00)
Continuity mistake: When the Green Day singer points his microphone to the crowd and the crowd sings the rest of the song, note the front of the crowd has nothing in their hands. After the singer says "We've been playing for three and a half hours. Now we'd like a minute of your time to say something about the environment", the shot returns to the crowd and everyone on the front row suddenly has a drink in their hands. (00:03:05)
Continuity mistake: During the Green Day concert, the lyric displaying teleprompter sits onstage beside the mic stand, but then disappears, reappears and disappears again by the time the barge sinks. (00:03:10)
Continuity mistake: The lead singer of Green Day disappears in the shot from behind the drummer's back - he is nowhere to be seen, even though where he was standing before means he should be visible from that angle. (00:03:20)
Continuity mistake: Green Day's monitor speakers disappear from the stage depending on the shot. Most noticeable when sinking. (00:03:45)
Continuity mistake: When the crowd throws food and drinks at Green Day's barge, the first overview shot shows various items landing on the barge. A few shots later there is another overview shot of the barge, only the amount of items has decreased. Then as one of the members says, "Gentlemen, it's been an honour playing with you tonight" and they take out their violins, all of the items on the barge have vanished. (00:03:45)
Continuity mistake: When Green Day start playing the violin when the barge is sinking, their feet are below the water. In the following shot, their feet are suddenly above the water. (00:03:45)
Continuity mistake: When everyone is saying "Lord hear our prayer" at the church, Kirk van Houten is wearing a blue suit, but later when Grandpa is freaking out, Kirk is wearing a red suit. (00:04:05 - 00:05:40)
Continuity mistake: At the start, people in the church switch places instantly. Most noticeable is Chief Wiggum who moves from behind Ned on the left, to a few rows behind Marge on the right. (00:04:20 - 00:05:05)
Continuity mistake: When we first see inside the church, the organist is playing on the bottom set of keys. Camera changes and now she is suddenly playing on the top set of keys. (00:04:40)
Continuity mistake: When Abe goes nuts in church, Comic Book Guy gets his phone to record him. When it cuts to Abe, Comic Book Guy is not holding his cellphone. However when the family roll Abe out of the church, Comic Book Guy is holding his phone again. (00:05:20)
Continuity mistake: As Grandpa freaks out in church, he falls on the floor after shouting "Whoa nelly!" and starts rolling around. In this shot, he is entirely on the red carpet. Comic Book Guy starts recording Grandpa and suddenly, his head is suddenly over the edge of the carpet. (00:05:30)
Continuity mistake: When Grandpa is freaking out in the church, at the point where he says "Trapped forever", Kirk (Milhouse's dad) is sitting normally. In the next shot, his arm is now holding onto the top of the seat. (00:05:40)
Continuity mistake: During Grandpa's freak out in church, as he says "Trapped forever", behind Kirk van Houten is Chief Wiggum. In the next shot, Professor Frink has suddenly appeared behind Kirk, and Chief Wiggum is suddenly behind Frink. (00:05:45)
Continuity mistake: When Grandpa is freaking out in church, he says, "twisted tail" while kneeling with his hands cupped, "a thousand eyes" leaning up against a pew, and "trapped forever" standing up and spinning. On Comic Book Guy's cell phone video he says all of these on the floor rolling around. He's also saying it faster on the cell phone video. (00:05:50 - 00:10:20)
Continuity mistake: At one point during Grandpa's outburst in church, Marge is shown standing up. In the next shot, she is suddenly sitting down. (00:05:55)
Answer: I believe the joke is supposed to be that the way Texans speak is a language all its own.
Damian Torres