There's one scene, however, that has always bothered me. It's the scene when Kevin (the kid left home alone) pulls out his sled and slides down the stairs and out the front door. Kevin positions himself against the left railing, yet the door is farther to the left than the left railing. By aligning with the left railing, Kevin can only go straight or right, and will thus slam into the house wall.
To make it out the front door, Kevin most position the sled on the right side of the stairs and aim to the left. This scene always bothered me, even as a kid. I guess it's the geek in me coming out. :-)