Corrected entry: When Lisa runs into Bart's room and throws a snowball at him, it is quite a powerful throw and on target as it hits him in the face. Yet when the kids are receiving academic alerts in the gymnasium, Lisa can barely throw the piece of paper she has been given. Surely she wouldn't have been able to throw the snowball so well if she lacked such skills?
Corrected entry: When Bart is crossing off the days in his calendar to show how long he has to go without seeing the no-good Jessica, he eventually circles the first day, a Monday, saying, "OK, day one," and then sits to wait. Immediately after, Marge sticks her head in the door announcing it's time for church - which is usually on Sunday.
Corrected entry: Another flashback mistake: When Homer remembers finding out that Marge was pregnant with Bart, he screams, tears out his hair and runs upstairs, past a picture of Lisa, aged 8, in the pink hat she wears to church. The mistake being that in this flashback neither Bart nor Lisa have been born. This mistake re-occurs seconds later: when Homer remembers finding out Marge was pregnant with Lisa, he runs upstairs past the same picture of Lisa aged 8.
Corrected entry: After Homer gets his job back at the plant and returns home to complain to a pregnant Marge about how much he hates his life, a picture of Maggie can be seen hanging on the wall behind the couch - despite the fact that Maggie hasn't been born yet.
Corrected entry: Marge is reminding Lisa of the differences between the UK and the USA before she goes to visit Hugh's family in England. Obviously the steak-and-kidney pie remark is a joke, but she says, "Remember, a mile is called a kilometer..." No it isn't. The metric system is used in mainland Europe - miles over here are still miles.
Corrected entry: In the show where Santa's Little Helper finds his mate and they have puppies, Monty Burns is out with Waylon Smithers. The two are on the street and see the puppies in a box. He starts stealing the puppies but SURELY the people around him (at least ten) would see that he was stealing the puppies.
Corrected entry: When Bart makes a phone call to the Australian boy, it is daytime in both Springfield and Australia. However when the Australian boy's father phones Bart, it is again daytime in Australia but night-time in Springfield. But due to the Earth's rotation, surely it would have to be night-time in Australia or possibly very early in the morning. It seems to remain daytime there.