Halloween Approximately - S2-E2
Other mistake: In the scene where boys are loading eggs into their slingshots, one of the eggs misses and falls on the roof, but doesn't break. A real egg would have broken.
Home Alone 4 - S1-E3
Visible crew/equipment: When the boys come out of the front door of the house to load into the van to go to the hospital the camera crew reflection is seen on the large picture window beside the front door.
Continuity mistake: When the Tarantula is put on Hal at the zoo, the shot is only of a yellow shirt with the tarantula crawling on it. When the shot changes to where they show the whole Hal, you can easily tell that the tarantula is fake - it is larger than it was and is in a different spot on Hal's shirt.
Visible crew/equipment: When Lois gets in the car after she gets offended by the fact that everyone in the family forgot her birthday, you can see a cameraman with the camera reflected on the rear window when she leaves. (00:10:15)
Kitty's Back - S6-E5
Visible crew/equipment: A hand is visible on the left edge of the screen when Francis is talking to Dewey through the bathroom door. (00:15:50)
Visible crew/equipment: When Reese throws the sheet off the bed a hand can be seen in the bottom right corner. (00:12:40)
Other mistake: At the beginning of the episode when they are driving in the car, the door is opened to make room for the camera outside but the opening is visible in shot. (01:49:00)
Reese Cooks - S2-E18
Visible crew/equipment: When Eric comes in to check on Francis, some crew members can be seen on the far left side of the screen. (00:13:45)
Character mistake: When Otto tells Francis he has to put a horse down, Francis objects saying he's never killed anything bigger than a poodle, and that was an accident. However, in season 4 (episode 11), Francis accidentally killed Otto's pet cow. (00:11:30)
Revealing mistake: When Lois confronts Susan about not telling her about Susan's kidney disease, Susan is telling Jamie how cute he looks in his sailor outfit. When the camera is moved to a different angle, it becomes very obvious that "Jamie" is just a prop baby doll. (00:11:10)
Factual error: It would be impossible for Malcolm to fall on the pins because the pinsetter is above them.
Dinner Out - S2-E4
Visible crew/equipment: Towards the end when Stevie punches Reese for the first time, his wheelchair swings back and a crew member holds and steadies it.
Revealing mistake: At the end, Malcolm speaks to camera with several children moving in the background. One boy doesn't know where or when to move and he tries to speak to someone off camera. In the end he gives up, shrugs his shoulders and walks off.
Other mistake: Reese is playing a Game Boy without a game in the slot.
Other mistake: In this episode Malcolm's new teacher begins a league table for the Krelboyne class, and since Malcolm shows that he is better than the whole class, the teacher creates a new highest rank for him which he calls "1 to the 11". However mathmatically, "1 to the 11" is still 1, so it seems rather strange that the teacher would go the trouble, and that none of the class would notice this.
Continuity mistake: When Lois is packing lunch in the blue cooler her hands go from on the side of the cooler to down by her waist in one frame to the next. No time for her to move it.
The Bots and the Bees - S1-E14
Continuity mistake: In the scene where Malcolm and the Krelboynes are talking and watching Robots after the opening credits. There is a blue schoolbag on the table but after it is gone, but when we see the table again the schoolbag is there again.
Continuity mistake: When Reese pushes off the table, he knocks one of the place mats out of place. In the next shot, it is where it's supposed to be. This switches back and forth in the scenes. (00:01:27)
Answer: It is made up - although it is implied she is Croatian, she never mentions it herself.