Factual error: The TV remotes of the day wouldn't control more than one TV at a time, yet they all come on and go off at the same rime.

The Muppet Movie (1979)
1 factual error - chronological order
Directed by: James Frawley
Starring: Frank Oz, Mel Brooks, Jim Henson, Jerry Nelson, Richard Hunt
Continuity mistake: When Gonzo is flying in the air holding on the balloons and then is shot down by Doc Hooper and lands on the car, the last two balloons are yellow and pink, but when the car takes off after Gonzo lands on the roof - the two balloons are now both blue.
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Answer: The closest thing to an answer is here, Martin Becker's obituary. His family states that it was a robotic Kermit on a bicycle. Outside of that, everyone else associated with the movie has been quiet on the subject.http://www.fridaythe13thfilms.com/saga/part5/martinbecker.html.
Rlvlk
They used gyros in the wheels - Martin Becker made the first self-driving bike for that movie-now the same tech is used in the self-driving bikes seen in the Netherlands. -Diana Becker, Martin's widow.