When the bell rings with Goofy inside it, he looks out suspiciously and says "Mice!" This is a reference to W.C. Fields who said exactly the same thing when there was a crash backstage during one of his comedy acts.
Donald:
Hey! What's the big idea?
Spring:
What's the big idea?
Donald:
Aw, shut up!
Spring:
You shut up!
Donald:
Oh yeah?
Spring:
Oh yeah?
Donald:
Says you!
Spring:
Says I!
Donald:
I'll bust you, you doggone snake-in-the-grass!
One version omits the scene where Mickey tries to get the stork out of the clock tower.
English