Muppet Movie, The - Balloon Change?
In the scene when Doc Hopper is shooting at Gonzo, who is airborne because of the balloons he bought at the fair, Doc Hopper hits the balloons, leaving two left. Watch the balloons carefully. When he first shoots the balloons, one is pink and one is yellow. After Gonzo lands on Fozzie and Kermit's car and the car drives off, however, both balloons are blue.