Continuity mistake: When Kevin goes to the grocery, he buys Tide detergent. While walking home, the two bags break, but no Tide detergent falls out.

Home Alone (1990)
Directed by: Chris Columbus
Starring: Catherine O'Hara, Daniel Stern, John Heard, Joe Pesci, Macaulay Culkin
Revealing mistake: As Kevin is flying off the front porch on the toboggan, you can see the small wheels mounted on the bottom of the sled to aid in its "jump". (00:25:30)
Other mistake: Kevin rides down the stairs on his sled and out the door. He originally lined up the sled at the top of the stairs, but it is clear that the stairs lie to the right of the door. His sled went straight down the stairs, therefore making it impossible to go straight out the door in one movement as shown. (00:25:25)

Trivia: When Kevin is in Buzz's bedroom, he finds in the box a picture of Buzz's girlfriend. This is actually a picture of the art director's son dressed up to look like a girl, because the director, Chris Columbus, thought it would be too harsh to make fun of a girl like that.
Trivia: Kevin's line "You guys give up, or are you thirsty for more?" was improvised.
Trivia: The infamous black and white movie was called "Angels with Filthy Souls." In "Home Alone 2," it was called "Angels with Filthier Souls" - it was a sequel, as was Home Alone 2.
Check-Out Woman: Are you here all by yourself?
Kevin McCallister: Ma'am, I'm eight years old. You think I would be here *alone*? I don't think so.
Kevin McCallister: This is extremely important. Will you please tell Santa that instead of presents this year, I just want my family back. No toys, nothing but Peter, Kate, Buzz, Megan, Linnie, and Jeff. And my aunt and my cousins. And if he has time, my Uncle Frank. Okay?
Megan McCallister: You're not at all worried that something might happen to Kevin?
Buzz McCallister: No, for three reasons: A, I'm not that lucky. Two, we use smoke detectors and D, we live on the most boring street in the whole United States of America, where nothing even remotely dangerous will ever happen. Period.
Question: Maybe I missed it, but did the McAllisters even bother to call home? I don't remember them calling the house at all. Why wouldn't that be the first thing they do? Kevin seems to be pretty independent for his age. He might have not answered the door, but I'm sure he would have answered the phone.
Answer: The phone lines were fixed by the end of the movie. Remember, this takes place over the course of several days.
Answer: That is also how Kevin was able to order his cheese pizza from Little Nero's.
Question: If Old Man Marley is actually a nice man (and not a "shovel slayer" as Buzz claims) then why does he always give Kevin that cold, creepy stare? After Kevin ran away the first time wouldn't he want to talk to Kevin the next time, to assure him that everything is okay?
Answer: Marley appears that way mostly because the audience sees him from Kevin's point of view. Marley is miserable and sad because he is estranged from his family, but we see him as a crotchety, unpleasant person because that is what Kevin believes. Buzz had tainted Kevin's opinion of him by spreading the false stories that a gullible Kevin believed were true.
Answer: Because he's understandably angry that Kevin's so unreasonably scared of him and assumes the worst in him without even getting a chance to know him. He never gets a chance to talk to him, because he always runs away too quickly. The first time he gives him that stare was when Kevin was watching him shovel from the window. Nobody would like to be stared at like that while doing a simple task.
Question: Why was Kevin's family so mean to him?
Answer: I think it was a way to make leaving him "home alone" more realistic and understandable as opposed to absurd. Being perceived as a brat/pest and annoying to be around, it is (somewhat) conceivable that none of the family members would be eager to have Kevin by their side. This "frees" all of them from noticing that Kevin isn't with them. Everyone would just assume that Kevin is somewhere among them and each be glad they didn't have to sit next to him on the way to the airport or during the long flight.
Answer: The ones who were mean just saw Kevin as a brat. However, it's not uncommon in situations of being in an overcrowded house to easily lose one's patience and temper and become frustrated with small, but irritating things; which seems to happen to his mother. Buzz just has that general big brother contempt for his kid brother, but obviously still loves him, along with everyone else in the family, at the end when he finds out Kevin is safe.
Nuts to that. They all could've tried a little harder, that's one lame excuse for treating someone like garbage and I come from a good sized bunch who've done the same to me. You also forget his uncle didn't care about him regardless of the situation.
Like it or not the answer is perfectly valid. Families have different dynamics. Kevin is something of a brat (he calls his mother "dummy" and openly wishes he didn't have a family), as are his brothers and sisters, especially Buzz. I for one have TWO uncles in my family who behave just like the uncle in the movie. We don't invite them over, but we've had similar situations to what's depicted in the film.
Hey I've had three uncles, father's older brothers, he hated all three of them, cared only when they started dying. Yeah the dynamics and all, my mother has stated "You ruined this family" though this bunch didn't need my help in being messed up. My sympathies to you Mr Hoffman, your uncles Dustin and Philip Seymour must be/been terrible, just kidding only on the famous names there, no offense meant.
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Chosen answer: They did but the power and phone lines were down due to a tree branch that had fallen on them the night before the family left. A flight attendant on their plane mentions that attempts had been made to call the McAllisters' home but "the phones are still out of order".
Jeff Swanson
But how did he call the police at the end if the phone lines were down.
That was several days later. Clearly the phone lines were repaired over the course of the film.
The film takes place over 3 or 4 days.
Ssiscool
After the storm the lineman tells them the power has been restored but the phone lines are "a mess" and that it would take several days to get them fixed. They were out initially, and then in various stages of repair afterward.
Also explains calling for a pizza.
Ssiscool
It's ridiculous though that the phones are apparently working by the time they land (Kate's SIL calls everyone on their street). Yet none of them try the house again.