Corrected entry: In the scene when Kevin bumps into the flight ticket attendant, he loses his ticket in the pile that falls to the ground. But in a later scene, when Harry catches him jumping off the hotel dock, they pull that same plane ticket out of his jacket pocket.
Corrected entry: When Kevin rolls out his "Operation Ho Ho Ho" plan, similar to the "Battle Plan" from the first film, the printing on it looks to be done by a very young child, with backwards letters, even. But later, when they show the note he wrote to Mr Duncan (the one he wrapped around the brick he threw through the window) the handwriting is much neater - and even a little feminine.
Corrected entry: When Harry decides to go into the house, after Kevin has thrown all the bricks, he walks off to the left, past other houses and down an alley. He then tries to enter the house through a window to the left of him. How can that possibly be the right house? He has walked too far and surely the house should be on the right.
Corrected entry: When Harry and Marv finally catch Kevin after he escapes from The Plaza, Marv looks at Kevin's boarding pass and says 'Round trip to Miami' before tearing it up. However, Kevin didn't have his boarding pass at this stage. While he ended up at the wrong gate due to a man wearing a trench coat similar to his dad's, he lost the actual boarding pass while crashing into the woman at the gate, allowing him to get on the wrong plane in the first place.
Corrected entry: Why didn't Kevin just throw the camera down to Harry and Marv? He had all the pictures of them robbing the toy store, he couldn't lose anything, and the two thieves would then stop chasing him, as Harry said.
Corrected entry: Kevin has his dad's bag, whose name is Peter, and while standing in front of the toy store when Harry and Marv spot him, the bag has "K. Mcallister" stitched on it. It should be a "P" since it is his dad's bag.
Corrected entry: When Kevin is running away from the hotel staff, he runs into his hotel room and he doesn't close the door, he just opens it and runs in the room. But when the staff reaches the room, the door is shut all the way, and they have to open it to get through.
Corrected entry: When Kevin records the commercial for the Plaza Hotel, the phone number is cut off by his father's voice. When Kevin is in the hotel later on, he plays the tape and his father's voice is not on it at all and he is able to hear the phone number perfectly.
Corrected entry: There is a moment in the movie when Kevin is throwing bricks at Marv and Harry. If you watch the moment of the first throw in slow motion you can see that Marv has blood on his forehead before the brick hits him.
Corrected entry: When Kevin first arrives in New York and does all of his sightseeing, there is a point where he is standing in front of Radio City Music Hall. He turns his back to it and takes a picture of whatever is across the street. He would really just be taking a picture of the side of a random building; there is nothing picture worthy across from Radio City.
Corrected entry: Why didn't anyone spot the burglars in the fish truck? Someone must have in a crowded place like that.
Corrected entry: When the McCallister kids are all asleep at the Plaza, the shot shows Fuller in the big bed and a few seconds before he wakes up, you hear somebody from behind the camera whisper, 'Wake up.' You have to be close to your TV to hear it and it couldn't have been any of the other McCallister kids saying it because everybody else was sound sleep.
Corrected entry: When Harry and Marv get hit by the toolchest, Harry asks, "What's that sound?" Marv answers, "That was the sound of a tool chest falling down the stairs." They had not been on the staircase it came from, and had not seen the tool chest or the stairs - both were blocked by the door.
Corrected entry: When Kevin is in his hotel room in the Plaza and hears a knock on the door, which is Mr. Hector the concierge who says (with a German accent) "Housekeeping," he runs into the bathroom and turns the shower on full. The next time we see him he has set up the blow up doll and a pulley system in the bathtub/shower. He is 100% dry. How did he set up such a system under running water without getting wet?
Corrected entry: No one is seen lining up at the cash register at Duncan's Toy Chest. A place like that would have a whole bunch of people lining up after their conversation was finished.
Corrected entry: In the scene where Tim Curry sneaks onto Kevin's hotel room, the time difference from where he knocks on the door until he arrives at the bathroom surely isn't enough time for Kevin to inflate the clown. And there is no point in inflating the clown beforehand, because how was he to know someone would sneak in? (00:35:55 - 00:37:15)