The Return of Maggie Beckett - S5-E9
Other mistake: The group slides to Fresno, where there is a monument to Maggie Beckett and the astronauts that were lost on an Intrepid mission to Mars. On the memorial stone, her name is misspelled as Maggie Becket, not Beckett as everywhere else.
Greatfellas - S2-E10
Deliberate mistake: When Quinn comes back to the hotel room with a large stack of money he'd won at the casino, he waves it, and you can see a 1-dollar bill in the middle. He was supposed to have over $100,000, but since the crew couldn't get that much money for a brief scene, they used a stack of dollar bills. (00:35:40)
Prof. Maximillian P. Arturo: More power, Mr. Mallory.
Trivia: The man who is homeless in "our" world, and is running for the U.S. Senator in the parallel universe, is the episode's director, Andy Tennant, making a memorable cameo appearance.
Suggested correction: The homeless man (Crazy Kenny) was played by Frank C. Turner, not Andy Tennant.
Question: In the pilot episode, the wormhole physically travels to "capture" Quinn and bring him back to his own world, after his very first slide. How did the wormhole know where Quinn was?
Chosen answer: Remember at first Quinn's timer is working perfectly (it's only because they slide off the ice age world early that it begins to malfunction) & given Quinn's intellect he would have devised a way that he could open a wormhole near him so he wouldn't be trapped on that world for 29 years.