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The stunt coordinator for the Movie Stunts segment is Kane Hodder, best known as Jason in the last four Friday the 13th movies. Grubby's stuntman is veteran stuntman Chuck Picerni.
Gabriella Ritts from Los Angeles, California who mails in the question asking for toys is the daughter of Mark Ritts, the actor who plays Lester.
Famous Dead Guy: Rear Adm Richard E. Byrd - Polar explorer
As the optical illusions segment is visual-heavy, the gang warns the viewer beforehand to record the segment.
Paul Zaloom counted Art Burn as one of his favorite characters from the series.
Famous Dead Guy: Archimedes (287BC - 212 BC)
Benjamin Franklin from Episode 38 (Benjamin Franklin and Chemical Reactions) does the Challenge Advisory.
This episode marks the return of "Scratchy the Chicken," aka Lester's right hand.
Phoebe (Senta Moses) plays Cleopatra with a Roman accent; Cleopatra was Macedonian by birth, nor Roman.
Famous Dead Girl: Cleopatra (69 BC - 30 BC)
Nurse Phoebe gives the warning to the electromagnetism experiment.
Charles Goodyear from Episode #72 (Rubber and Hair) does the experiment advisory.
Famous dead guy: Joseph Priestley (1733-1804), discoverer of oxygen.
A bosun or boatswain, mentioned in the Beakmania intro, is the warrant officer on the ship in charge of the rigging.
This episodes includes an appearance by BeakMom.
Famous Dead Guy: Wilhelm Roentgen (1845-1923)
Famous Dead Guy: Charles Goodyear (1800-1860), who discovered vulcanization of rubber.
The warning advisory for this episode was given by Meekman's doctor (Mark Ritts).
This episode features a visit from fictional character Lemuel Gulliver, from Gulliver's Travels. In the novel, he visited the island of Lilliput populated by people much smaller than him, Brobdignag, populated by people much larger than himself and other realms. He is depicted as ridiculously tiny and demonstrates the rule of scale.
Famous Dead guy: Robert Bunsen (1811-1899), whose laboratory developed the Bunsen burner.