Continuity: When Joe Pesci places his hand on the red hot doorknob on the front door of Kevin's house, he places his hand on the doorknob sideways, but after he sticks his hand in the snow, he looks at his hand and the letter M that was burned into his hand is straight up and down, not sideways like it should be based on how he grabbed the doorknob.

Revealing: The morning the McCallister's are rushing to get to the airport, the kid from across the street is bothering one of the van drivers. In the scene where the van driver says, "Gee, kid I dunno, hit the road," you can clearly see the kid mouthing the words as the man speaks.

Continuity: Kevin goes out to cut the top off a tree to use as a Christmas tree. The tree top he drags in is much smaller than the one he decorates.

Continuity: When Kevin says, "I made my family disappear" and runs around the house, he runs to the foyer and spins in a circle. The window near the stairs is dark meaning it's dark outside. He run upstairs and the window in Kevin's parent's room is also dark. The lights are on too. He then goes to Buzz's room and the kitchen and it's light outside. No lights are on.

Continuity: When Kevin is leaving the church after talking to the old man that lives next door to him, he runs home. Between leaving the church and getting home he is wearing one pair of trousers, when he gets home he is wearing a pair of jeans, then when he is setting up the traps for the bad guys he is back to other pair of trousers.

Visible crew/equipment: In the scene where Kevin rides the rig on the rope to get to the treehouse, you can see that it was a stuntguy, because Kevin is much smaller.

Continuity: In the scene where Kevin goes flying into his treehouse and breaks out the wood, the amount of wood missing changes from one scene to the next.

Continuity: When the first shot of the rigged rope is shown outside of the upstairs window, the rope appears to be horizontal. Yet, when Kevin rides down it, the rope appears to now be sloping downward towards the treehouse.

Other: Toward the end of the film, there is a scene where Macauley Culkin rides a rig on a rope from his house to the treehouse. Joe Pesci and Daniel Stern try to follow, but Culkin cuts the rope with a hedge cutter. Problem is: The rope is slack when Mac cuts it. With the weight of two grown men, it would have been stressed like a guitar string.

Continuity: When Marv comes to the back door while Kevin is washing dishes, Kevin turns on the Johnny & Snakes movie. Then he goes to get the pot and puts the pot by the back door. The whole time he has his sleeves rolled up, but when he opens a drawer to get firecrackers, his sleeves are rolled down. In the very next shot they're rolled up again. The shot changes too quickly for him to roll them back up.

Continuity: Right after Marv loses his shoes on the tar covered stairs he goes back outside to go in the window. When he's running in the snow you can see that he is wearing little pink booties so his feet don't get cold.  When he is getting into the police car at the end, you see a short shot of his feet when he's almost in and you can clearly see he has black boots back on.

Continuity: In the scene where Kevin is putting washing in and taking clothes out of the drier, he places the orange bottle of liquid on top of the washer with the handle facing away. On taking the clothes out of the drier and closing the door, he turns to see the metal heater scaring him by saying "Kevin.". Look over his left shoulder when the shot comes back to Kevin, the orange bottle now has it's handle facing outwards, and the top isn't on properly.

Continuity: When Kevin's father leaves the table to stop Kevin from annoying Buzz, the Pepsi bottle is going to fall, In the following shot, the bottle is not falling and the dishes have moved.

Continuity: In the scene where Kevin is hanging up ornaments on the Christmas tree and he sees Harry peeping through the window by the reflection of the ornament, the reflection is not entirely accurate. It shows Kevin facing the camera with both the tree and window behind him. The reflection should have shown Kevin with just the window behind him and slightly to his right, based on his original position.

Continuity: The flight that the McCallisters take from Chicago to Paris is one of the slowest Trans-Atlantic flights on record, especially considering it's on a Boeing 767. Their flight takes roughly 24 hours; a normal flight from O'Hare to Paris takes roughly 8 hours.

Continuity: In the scene where Kevin prepares to ride his toboggan down the stairs, the front door changes position between half open and completely open.

Factual error: In the scene towards the end where Kevin dials 911, we get a shot of the phone with a logo that reads "BellSouth Products" on it. In the Chicago area in 1990, the phone provider would not have been BellSouth, but Ameritech, which is based out of Chicago.

Visible crew/equipment: When Harry and Marv are making their way across the rope to the tree-house, you can see them dangling in a long shot. It has to be stuntmen because, despite the 12 inch height difference between the characters, they seem to be the same size while hanging there.

Audio problem: When Kevin is going through Buzz's private things he finds a picture of his girlfriend. Sickened by her appearance, he smashes the picture. But the smashing sound starts before he hits it.

Continuity: When Kevin is searching in Buzz' chest, some objects appear or change place after he throws the Playboy magazine away.