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I never noticed that Kevin's plane ticket got put in the trash til someone on a message board mentioned it and then noticed the next time watching.

That Kevin was able to fall off that high shelf in Buzz's room without any type of injury.

That kevin lit fireworks in the house (to scare Marv) and nothing was destroyed. Fireworks aren't meant to be lit in a house.

When Kate is talking on the phone at the start she says that they already put the dog in a kennel. Never caught that before, and always wondered why they had a doggie door, but no dog.

On the plane after they realize they left Kevin, the flight attendant brings them a glass of water. Peter takes it and tries to hand it to Kate. She doesn't even acknowledge it, so Peter just shrugs and drinks it himself.

When the family is leaving Katie at the airport, Peter and her kids are all emotional and hugging her, except for Buzz who is off to the side combing his hair, with his back to his mother.

Marv has a collection of snow globes on the dashboard of their van. After they leave the Murphie's house he puts a new one up there. So aside from leaving the water running, he keeps a snow globe from every house they rob.

Harry suggest waiting to see who "blew away Snakes" in case the police bust them, so they can answer their questions. In other words, he was willing to be a rat. The exact opposite of most of Joe Pesci's characters.

I noticed a micro machine cameo when he put them on the floor as a trap