The dog used in the alley scene could not stay still long enough to play dead, thus the "dead dog" is actually digital.
The Diva Society scene required an auditorium full of extras, but no extras could be found. If you look closely, you'll notice that there are only 4 different people in the audience (all crew members), digitally duplicated to fill the entire auditorium.
Clearances to show a trademarked cartoon character doll on Snowy's bed could not be obtained, so the doll was digitally altered to become a miniature Big Blue Boo-Boo Bug doll instead.
Dialing the phone number that Donald calls on the pay phone would connect you to the switchboard at Disneyland.