How i’ve always sort of pictured it is that Buzz is so delusional in his “Out-of-the-box” state, because of the technology involved. He is by far the most advanced Toy we’ve seen in any of the movies. Slink is a plastic dog with a metal Slinky in the middle, Rex is a plastic Dinosaur, Ect. Woody kinda comes the closest out of Andy’s toys, because he actually talks. Even if it does “Sound like a Car ran over it”.
In a way, Buzz is sort of “Programed” to think he is actually Buzz Lightyear. Since he has Chips and Copper Wiring in him. The voice commands all say who he is and what he does, and he treats them as if they are his own voice recordings. And he has wings, and glows in the dark, which would make him think he is the real Buzz. Sort of how a robot is programed, I always saw it as Buzz is sort of “programed” in a similar way.
I would have thought that Woody and the others would have been the same way, but he is shocked to see that he was part of a show. Yet when he sees the record player he says “I haven’t seen one of these in ages”. Andy being only 6 at the first one would have been too young in 1995 to have really been in contact with one. Which adds to the thought that Woody was a hand-me-down from Andy’s father. But then again, Woody doesn’t run on batteries. Also the other toys arn’t surprised to see that he thinks he’s the real Buzz. Only Woody notices that he thinks he’s real. If every toy thought they were real when they first got to Andy’s room, the ones that were there before them, like Woody, (possibly Potato Head) would be used to Toys thinking they were real, and a couple would mention something like “I hate to break it to you, but you are a toy” instead of the eventual “You actually think… that you’re the real Buzz Lightyear? All this time I thought it was just an act!” Jessie and Bullseye probably were aware they were toys, and realized they were the Round-Up Gang after seeing Al’s collection.
On the note of the Prospector, I sort of see it as over the long period of time of being on the Shelf, he slowly and progressively became more of the Intelligent version as he watched the other toys one-by-one be sold. So by the time he got to Al, he was like he is in TS2.
Oh, and on the Aliens, they are only somewhat aware of what they are… At least to how I get it. They sit in the glass dome watching the claw “Choose” them, and after a while they sort of pieced together their own sort of Mythology of what it is. A Claw that will choose them to find the Mystic Portal. And them being Adopted by the potato heads sort of suggests they are kinda like Children, sort of nieve to interpret things in their own way. Because even after meeting other toys, they still refer to things like the “Mystic Portal” in the Airport, and the “Wand of Power” in the Pizza Planet truck.
Again, most of this stuff is my own interpretation of what’s what, but I think that Pixar leaves a lot of this stuff open to individual peoples ideas. Most people who watch the movie don’t think quite as deeply as we do… Just saying.
Sorry, all for such a long post. I’ve done quite a bit of thinking on this topic, and I figured i’d spill my guts and share with you guys.
EDIT: You actually brought up a pretty good point, love70ways. I was pointing out all the reasons why Buzz is the only one that would be delusional, but I over looked that Rex kinda does think he’s real. “Were you Scared? Tell me Honestly. I’m going for Fearsome, but I just don’t feel it!” There’s actually a bit of evidence to point to both. It’s like they think that they are both… Like Rex believing he’s a Toy Dinosaur. As a toy he wants to be there for Andy, but being a Dinosaur he wants to be the Dominant Predator. Before I start to rant, I’ll just say that it can be taken either way, depending on what you think of it.