I know how they did it!!!
"Before you get shrunk, however, there are some gags which involve duplicates of mice that will have the youngsters freaked (and the rest of us wondering exactly how it was done)."
I know how they did THAT, since I work it her in Disneyland!! I don't know if I want to tell you!!
O k, here is how they do it: There is a hole in the front of the chair and air blows a big rubber string out of it to create a feeling of a mouse tail.