We finally figured it out
A lot of people wonder how Kevin could have racked up $967 on room service at the Plaza Hotel, and all they show on the bill handed to Buzz (which is very long and covers at least 5 pages) is the ice cream he ordered.
My dad, and brother, and I were all watching this again a few nights ago, and realized how the bill could have gotten so high.
1.) It always costs more to have the hotel staff deliver stuff to your room personally. It's the same rule that, say, a takeout food service follows: it's more expensive to have someone come to your house and deliver the food to your door, rather than go get it yourself from the restaurant it was cooked in.
2.) Kevin was staying at a very expensive hotel, (which is still expensive today, and is still around in the present era). Everything, including room service, is pricey; which is why only the rich stay there.
3.) It appears he was staying there for a maximum of three days, maybe two. Kid's gotta eat, and I doubt he was always eating ice cream. So it's possible he ordered food for other meals as well, such as breakfast, lunch, and dinner, and had them all delivered to his room. No doubt the food was made with expensive ingredients in the kitchens of the hotel, or ordered from restaurants outside the hotel.
4.) Not to mention he had his clothing laundered, dry-cleaned, and brought back to his room. I mean, Kevin only had his carry-on bag, his dad's bag, and the clothes on his back when he came to New York City, and obviously the kid believes in personal hygiene, so he had to have his clothes cleaned at some point.
5.) The room he was in had a cabinet full of snacks and booze, and if the Plaza Hotel follows the same rules many hotels do, they charge you for anything you take out of cabinets like that. Kevin obviously knew to stay away from the booze, but he took a bunch of cookies with him, which were probably included in the bill.
So the bill might have been covering the other food and laundry service that we only got hints about.