Continuity mistake: When Chunk runs to the window, to watch the police chase, in the interior shots he stands in front of divided window panes, but in the exterior shot facing him he stands in front of a single pane of glass. (00:04:10)
Continuity mistake: Just after the police chase passes Chunk at the window, the lead police car swerves and hits the road block, knocking it over in the wideshot. Next close-up that swerved car stops right beside the road block, not touching it. (00:04:20)
Continuity mistake: After Chunk does the 'Truffle Shuffle' and Mikey releases the bowling ball, we see the horizontal piece of wood that is painted red and attached to the porch rail, from which the silver bucket is lowered. It's seen in many shots. What's funny is that in the first shot of the Walsh's house, after the Fratellis drive past at the bottom of the hill, that piece of wood is white, because it hasn't been painted red yet by the crew. (00:05:10)
Continuity mistake: At the start, in the second exterior shot of the Walsh's house, after the Fratellis drive past at the bottom of the hill, we see Mikey sitting outside his window beside the small, all black telescope. In the next interior shot the telescope is a different style, it is now grey/black and quite larger. (00:05:10)
Continuity mistake: When Mikey pulls the cord to release the bowling ball, the rocking chair is parallel to the railing, facing the porch, but in the opening shot of the house it was closer to the stairs and facing the yard. (00:05:10 - 00:07:35)
Continuity mistake: Up in the bedroom, when Mikey jumps on Brand who's bench pressing, he grabs hold of the bar and his hand is on the outside, with Brand's on the inside, but close-up their hands have switched. (00:05:50)
Continuity mistake: When Mouth walks into the Walsh's house, there is a jacket hanging on one of the four hooks in the hallway, but when Mouth opens the door and sees Chunk at the gate the jacket's gone. We know it didn't just fall down, because we can see the floor below the hooks in later shots. (00:06:25)
Continuity mistake: When Mouth first shows up at the Walsh's, in the wideshot as Brand is stretching the chest expander, Brand's left leg is crossed over his right, but in the close-up it's right over left. (00:06:30)
Continuity mistake: There is a rather tall plant beside the Walsh's front door, in the corner, that keeps moving from the corner to the front of the draperies, then back again, throughout the early scenes. (00:06:50)
Continuity mistake: When Brand runs down the stairs to take the paperwork from Mr. Perkins, the large hanging plant that should be over Mikey is gone, but it was there when Chunk arrived and is back later. (00:07:25 - 00:20:25)
Continuity mistake: When Mouth stands by the door cracking up at Chunk's 'Truffle Shuffle' and in more following shots, there is nothing on the wall behind him between the hutch and doorway. After Data breaks through the screen door there is a large painting hanging there. (00:07:30)
Continuity mistake: When Chunk waits to be let in at the gate, Mikey pulls the cord to release the bowling ball and there is a long blue handle (broom?) leaning against the window, but it isn't there in previous and following shots. (00:07:30)
Continuity mistake: When Chunk waits for the gate to open after doing the 'truffle shuffle', a red balloon starts to blow up, but next shot it's a pink balloon that pops. (00:07:40)
Continuity mistake: After Chunk walks in, when Mouth and Mikey kneel in front of the aquarium Mouth's white sock is visible, but when Chunk places the statue on the edge of the table and it falls, we see that Mouth's sock has vanished. (00:08:10)
Continuity mistake: When Data places the cassette into the tapedeck and grabs hold of the bar on the zip-line, his palms face him as he takes off, but next shot as he slides down his palms face out. (00:08:50)
Continuity mistake: When Data crashes through the screen door, sending Chunk to the floor with the statue, in the first shot there is a long bright stream of sunlight shining on the carpet, between Chunk and the stereo which disappears in the next shot. (00:08:55)
Continuity mistake: After Data breaks through the screen door and causes the pile up, the potted plant that was on the table is already lying on the floor in the next shot of Chunk catching the statue, even before it falls and hits the floor. (00:09:00)
Continuity mistake: When Brand hangs upside down from the bar, we can see that the kitchen table and four chairs are right in front of the kitchen window. But when Mikey unrolls the map in the kitchen, Chunk, Data, Mikey and Mouth are standing directly in front of that kitchen window, which is completely impossible to do. (00:09:40 - 00:22:35)
Continuity mistake: When Mrs. Walsh shows Rosalita the house, the attic door is open and we see that it opens at the left, with the wallpapered wall behind it and nothing in front of it except the banister. When Brand opens that door and the boys rush up, we see the wallpapered wall behind it, only this time the attic door opens at the right. (00:11:25 - 00:13:50)
Continuity mistake: When Mrs. Walsh, Rosalita and Mouth go back downstairs, after Mouth's interesting interpreter skills, in the first shot Rosalita holds her umbrella in her left hand upside down, but next shot it's in her right arm, right-side up. (00:12:25)
Answer: He says, "He is a big strong man."