I found a clip on YouTube that features a trip to Walt Disney World's Magic Kingdom from 1977-78. There I found sound clips of the Mickey Mouse 50th Birthday Parade!
The parade included Mickey himself, numerous Disney characters dancing with pompoms, and a life-size, sneezing animatronic Elliot (not the dragon from the Electrical Parade!
Also includes scenes on Adventureland's Jungle Cruise, Tomorrowland's WEDWay PeopleMover, and Main Street, U.S.A.
Here it is! Starts at 2:35.