I have seen the Wizard of Oz (once)
I just don't think I'd have made the connection even if I had remembered it. When was it - 1939?
It's funny you know, but its the great divide again! Popular culture, particularly TV, is still quite different. You may buy our films & TV programmes and we do the same from you. However the catch phrases and expressions that we retain are totally different.
For example, from Minder the term - 'er indoors (meaning the wife) is almost part of the language.
"I don't believe it"
"Here's one I made earlier"
"Gissas a job"
"Bob will fix it!"
are all probably uniquely British
However
"Phone a friend?"
"You are the weakest link - goodbye" probably made it intact over to you.
Paul