Audio problem: When Doc Hopper drives up to the town and some of the muppets are in the bus, Fozzie says "oh no" but it is Scooter's mouth that moves.
Audio problem: When Gonzo is flying over the countryside with the balloons, his mouth never moves during all his lines except "Ah this is the place to be. Whoopeeeeee!"
Plot hole: How did Professor Krassman get shocked into being a frog? The electronic device doesn't even touch his head.
Answer: This is Big Bird's only movie where he says this line. It is a reference to his going to New York hoping to get a role on Public Television (the station that created "Sesame Street") This is verified in TV interviews with the late Jim Henson and on Wikipedia.
OneHappyHusky