Simmons' Documentary / Big Bob's Crisis - S5-E20
Continuity mistake: Simmons' Documentary: Rhonda wears a black top and red skirt on the day of the documentary, but in one shot, she is wearing her regular outfit. She is also wearing her regular outfit in one shot when the class is watching the documentary. (00:06:12 - 00:11:16)
Simmons' Documentary / Big Bob's Crisis - S5-E20
Continuity mistake: Simmons' Documentary: When Mr. Simmons explains the documentary and the kids leave the classroom, Arnold is holding a purple book. In the next shot, it changes direction while in his hand. (00:01:50)
Back to School / Egg Story - S4-E8
Continuity mistake: Egg Story: When Arnold shows the little chick to the class, Phoebe is sitting behind Harold, but she is suddenly standing in the next shot. (00:22:30)
Weird Cousin / Baby Oskar - S4-E11
Continuity mistake: Weird Cousin: When Lila tells Arnold, "Going to a movie together sounds kind of like a date," the way she holds her book changes between shots. (00:01:41)
Grandpa's Sister / Synchronized Swimming - S4-E12
Continuity mistake: Synchronized Swimming: During the swimming tournament, the boys take off their jackets beside the pool. When the boys jump in the pool, they disappear. (00:20:55)
Love and Cheese / Weighing Harold - S4-E7
Continuity mistake: Love and Cheese: When Arnold asks the man at the CheeseBall Toss for three tries, Eugene in the background has black skin and a red shirt, like Gerald. His shirt is also red in a later shot when Arnold is trying to knock the bottles down. (00:05:52)
Arnold & Lila / Grand Prix - S3-E13
Continuity mistake: Arnold and Lila: When Lila starts talking to Arnold in the cafeteria, the sandwich on Arnold's tray has sandwich bread, but in the next few shots, they change to hamburger buns. (00:04:06)
Arnold & Lila / Grand Prix - S3-E13
Continuity mistake: Arnold and Lila: When Arnold and Lila sit down at the table, the borders of their trays are missing, then return in the next shot. (00:04:20)
Arnold & Lila / Grand Prix - S3-E13
Continuity mistake: Arnold and Lila: Arnold and Lila have milk cartons on their trays when they sit down at the table, but in the next shot, Arnold's milk disappears, and Lila's milk is beside her tray. (00:04:20)
Arnold & Lila / Grand Prix - S3-E13
Continuity mistake: Arnold and Lila: Helga writes "Arnold loves Helga" on the wall, then replaces "Helga" with "Lila". In the next few shots, the way the word "Lila" is written changes four times. (00:02:48 - 00:03:21)
Continuity mistake: Ms. Perfect: The red strings attached to Lila's table and chair are only there as Lila is getting pranked; they are not visible in any other shot of the table. Also, when Rhonda pulls the string attached to the table, the string attached to the chair isn't there. (00:18:32)
Continuity mistake: Ms. Perfect: When the girls prank Lila, the table has its flap down, there are four chairs around it, and there is nothing on it. When Helga walks Lila over to the table, the flap is up, there are only two chairs around it, and a "Reserved" card appears on it. When Lila runs out of the cafeteria, there are four chairs around the table again. (00:18:06 - 00:18:48)
Love and Cheese / Weighing Harold - S4-E7
Continuity mistake: Love and Cheese: When Helga drills the hole into the back of Arnold and Lila's boat, she drills it into the side of it, but when it's shown from inside the boat, it's in the center. (00:09:06)
Love and Cheese / Weighing Harold - S4-E7
Continuity mistake: Love and Cheese: Helga drills a hole in the back of Arnold and Lila's boat, but in all the following shots where the back of the boat is shown, the hole is not visible. (00:09:07 - 00:10:31)
Love and Cheese / Weighing Harold - S4-E7
Continuity mistake: Love and Cheese: When Arnold and Lila's boat is stuck at the edge of the waterfall, Lila says, "Arnold, what will we do?", and when the shot changes, Arnold and Lila's hands both move to a different part of the boat. Lila's braids also go from being in front of her shoulders to behind them. (00:10:15)
Gerald's Game / Fishing Trip - S5-E15
Continuity mistake: Gerald's Game: When Arnold asks Gerald if he was in the alley near Dr. Steiglitz's office, there is nothing in the bottom shelf of Gerald's locker. When Gerald puts his book "The King Rules" in his locker, some books appear in the bottom shelf. (00:03:34)
Gerald's Game / Fishing Trip - S5-E15
Continuity mistake: Gerald's Game: When Arnold asks Gerald if he was in the alley near Dr. Steiglitz's office, Gerald is holding three books, with a purple book on top, and a green book on the bottom. Right before he drops them, the two books have switched place, and the purple book changes to blue. (00:03:24)
Summer Love (a.k.a. Beach Story) - S5-E9
Continuity mistake: In the scene at the end where "Babewatch" is being filmed, when Arnold drowns and the lifeguards save him, he is wearing his plaid shorts. A shot later, he is wearing his blue swim shorts. (00:22:34)
Weird Cousin / Baby Oskar - S4-E11
Continuity mistake: Baby Oskar: In the shot where Suzie tells Oskar, "As long as the baby is here, he's going to have to come first," the stove is drastically further away from the door than usual. (00:13:21)
Timberly Loves Arnold / Eugene, Eugene! - S5-E22
Continuity mistake: Timberly Loves Arnold: When Timberly and Arnold start crossing the street together, Iggy is standing far away from Rhonda and Sid. In the next shot, he is closer to them. (00:02:57)
Answer: The episode doesn't really elaborate on who the kid was and what his motives were, so its pure speculation as to why he took it. Perhaps the kid could simply want a ball all for himself and decided to just take it, or was simply a rotten kid. The truth is the kid's motives are not important to the story other than it highlights Arnold was having a lot of trouble getting through the list.
Lummie ★