Of course, I had to Google more references.
And I found the following:
http://www.magicforum.eu/viewtopic.php?f=37&t=11148&start=20
There are a lot of Disney references in the series. So I did some research and found out that co-creator Bill Prady wrote the Disney attractions Jim Henson's Muppet*Vision 3D and Honey, I Shrunk the Audience.
Found this quote on a random site:
There seems to be at least one reference to Disney in every episode of The Big Bang Theory, and tonight's installment was no exception. Since the Big Bang guys are all comic fans it seemed inevitable that a Disney comic book reference would pop up sooner or later, and tonight's was a good one. In this episode entitled "The Wiggly Finger Catalyst," Sheldon used the often-discussed question of whose fortune is larger, Richie Rich's or Uncle Scrooge's, to describe Raj's wealth. (The answer is, needless to say, Uncle Scrooge.) Sheldon simply explained that Raj's family is "Richie Rich rich" or "about halfway between Bruce Wayne and Scrooge McDuck.' Leave it to Dr. Sheldon Cooper to put it all in perspective in such a colorful comic-centric mannera way which even the non-geniuses among us can understand.
ETA: Found this on a DIS thread:
http://www.disboards.com/showthread.php?t=2651634
I still remember the episode - The Large Hadron Collision, where Leonard gave Penny clues about what they were going to do on Valentine's Day. (Milk chocolate and Swiss Cheese Fondue)
Her first guess going to
Disneyland to ride the Matterhorn and her second guess was going to Disney World to ride the Matterhorn.
Mentally I was like "Would that be the non-existant Matterhorn because there isn't one at Disney World?"
See the clip here:
http://www.youtube.com/watch?v=mL9XeopaOTY
BTW, I did a quick google of the shows creator - Chuck Lorre. Not sure if you ever noticed the vanity cards at the end of each ep, but this one might help explain.
http://www.chucklorre.com/index-2hm.php?p=115
Basically he has a long track record with ABC - Dharma and Greg being one of many shows he was involved with. He is also apparently a Disney stock holder. I'm guessing if he's using the same pool of writers they also have ABC experience.