A small tag attached to a vintage toaster is where you will find this reference.
Let's zoom in for a closer look.
"Number one Christmas boutique gift item"
This is an actual quote from Peter Venkman (Bill Murray) in the movie. Can't remember the scene? Watch the clip below. Venkman says it around the 0:56 mark.
So there you go. Now you can go to sleep at night knowing that a quote from Ghostbusters 2 is a part of a Disney theme park.