Continuity: Just before Bart's flashback, his shirt is orange, and the chair he's sitting on is blue. But in this episode, his shirt is a paler shade of orange and the chairs in the classroom are red.

Other: When Bart enters the school bus at the day of history test, we see close-up of his "Early American History" book open about in the middle, on the page saying "Chapter 1".

Continuity: Bart's 1st grade drawing of cat on the fridge changes across the episode, especially its ears and whiskers.

Audio problem: When Bart calls Milhouse to get the answers to the history test from him, Milhouses voice sounds a lot different from his usual voice. It sounds more like Mrs. Krapabbel's voice. Submitted by Twotall

Continuity: When Bart hands Ms.Krabbappel his final test, there are some shots going back and forth between their faces. During the first shot looking at Ms.Krabbappel, you can see a window behind her, and outside the window, there is no snow, even though there was a whole lot of it yesterday. During the next shot, the snow IS there. As the camera goes back and forth, the snow disappears and reappears.

Revealing: When there is a zoom in of the house just before Bart gets up late, it has the old arch-shaped windows, but in the rest of the episode it has the normal windows. It's obviously a screen from Season 1.

Continuity: When Lisa shows her exam to her family, the "a" note keeps changing from being circled in red and in a red round. Submitted by Dr Wilson

Continuity: When Martin does his book report, on the blackboard it says 'An afternoon with Ernest Hemingway : Reflections by Martin.' But when Bart goes up to do his report, the blackboard is clean. Submitted by Hamster

Continuity: Near the start, when Homer is going through the medicine cabinet and we see various items. He takes out various hair growth products, and then when we see what's left, the floss has vanished.

Continuity: When Homer is giving people tartar sauce at the cafeteria, he says "plenty for everybody" with his mouth closed at the end of him saying it. However the photo in the newspaper is shown with his mouth open. Also, for the last part of "everybody" his mouth doesn't move.

Continuity: In "Hungry Are The Damned", when the family are looking up at the UFO and Homer says that the burgers are getting cold, the burger he is eating has a bite out of it. In his close-up it is a whole burger.

Continuity: In the Raven scene, you can see Homer's drool on his jacket, but in the next shot and following shots it's gone.

Continuity: When the Simpsons are about to eat on the spaceship, in one shot just before they eat there are 3 candles on the table, and when they all sit down they're gone.

Continuity: When Homer is preparing the barbecue, he is wearing an apron that says "Mafia staff apron". After he goes to pick up the lighter fluid, it reads "Maffia staff apron", and after he has lit the barbecue, it is back to saying "Mafia". Submitted by Twotall

Continuity: In Hungry are the Damned, when The Simpsons are on the spaceship and the aliens show them the food, there are 3 pots and two plates. Yet when the shot changes there are 4 pots and no plates.

Continuity: When the Simpsons are eating for the second time the alien on the very left, which previously had spots on his cheek, now has no spots.

Continuity: After the aliens have dropped off the Simpsons in their back yard, Marge is seen wearing her usual red pearls. Except in the final shot of the family. Then her pearls are white. This is not due to the alien light source altering the colors in the segment, because Marge's pearls have been a dark color through the whole episode, even inside the alien spaceship. Submitted by Twotall

Continuity: When Bart is unpacking his things from the box, if you look at the mantelpiece, we can see that there is a candle on the right hand side of it. But later on, there is a candle on the left hand side which wasn't previously there.

Continuity: The shot glass that Burns places on his desk disappears for several frames before reappearing.

Continuity: After the safety expedition has taken place, we see that when everyone is in Burns' office that by his main doors there are 4 buttons on the wall. Yet when a shot from further away is shown, they are not there.