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.
Visible crew/equipment: As Miss Piggy jumps from the overhead platform onto the goons, the man that tossed her is briefly visible as he ducks down.
Revealing mistake: As Kermit walks by the bus, the lower portion of fabric covering the operator's arm is visible.
Revealing mistake: As the camera pans down to Kermit sitting in the empty sound stage, it's easy to tell that the sides of the stool are actually solid with the background painted on them to hide the puppeteer.
Continuity mistake: In the outer office, as the secretary begins to sneeze, the fan is already on. Kermit then goes to turn on the fan to blew animal dander at her. Also, as they make noise, Kermit is heard talking, but his mouth doesn't move.
Visible crew/equipment: As Kermit approaches the doors to see Lew Lord, the sleeve part of the puppet, as well as the top of the puppeteer's head can be seen.
Continuity mistake: As Kermit faces Hopper, there's a large black square behind Kermit, between Fozzie and Doctor Teeth that only appears in the long shot.
Visible crew/equipment: As Fozzie, Kermit and Piggie chase after Gonzo, the camera vehicle is reflected on the nose of the car.
Continuity mistake: When the duo stop at the church, the wording on the sign is either shaded or dingy. But a moment later when they go to get out of the car, the sign's lettering is clean and bright.
Visible crew/equipment: As Kermit is riding the bike, just before the scene transitions to him passing into town, there's a shadow of a boom arm that's guiding him on the ground behind him.
Continuity mistake: In the close ups of Kermit playing the banjo, his arm moves, and when in wide shot, only his hand moves over the strings.
Visible crew/equipment: In the opening sequence, as the camera is in close up on Kermit playing the banjo, as he strums, the puppeteer's finger controlling the rod comes into the frame several times.
Continuity mistake: As Kermit and Fozzie stop at the Frog Legs billboard, it's easy to see that it's out in the wide open. but when the "Myth, Myth" gag is used, there's suddenly trees directly behind it, where the lady pops out saying "Yes?"
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