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Stewie tells Brian that changing the past can alternate the future, but back in "The Road to Germany" Stewie tells Brian that they can do what they like in the past.
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Future Brian tells the 1999 version of himself to write the Harry Potter novels. However, the first novel in the series was already published in 1997 and would have already existed in 1999. Therefore, Brian could not have written them.
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Since the Stewie's time machine was blown up during the events of "Road to Germany", he must have built another identical time machine since that episode.
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Quagmire claims that Cheryl Tiegs left him because he got jealous too easily. However in the episode, "And Then There Were Fewer," he claimed that she left him because James Woods stole her from him.
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Brian and Cheryl Tiegs (and later Quagmire and Jillian) are seen dining in a restaurant called "l'Espèce d'Andouille." In French, "espèce de" translates to "stupid," and "andouille" is a slang word for "imbecile" or "idiot," making the name of the restaurant essentially "The Stupid Idiot" or perhaps just "The Idiot."
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Chris did not appear in this episode.
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Chris' birthday is February 8.
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The song that Franz Gutentag is singing while moving a "Chris" puppet is "Der Kommisar" by Falco.
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German used in this episode:
"Gutentag" means "good day", "Schlechtnacht" means "bad night".
The sign on the right door reads "keine entranz mit platz munchen" which means "no ... with place munich". "Entranz" isn't German.
The sign on the left door reads "gluck mach nicht enmechwerchtich lieber" which means "luck make not ... rather"; "enmechwerchtich" is gibberish.
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The song "Mr. Booze" is from the movie "Robin and the 7 Hoods."
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Near the end of the episode, Cleveland is watching the Quahog Channel 5 News, which he shouldn't have been able to do since he is in Stoolbend, Virginia.
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Chris, Meg, and Stewie were not in this episode.
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Brian has found the baloney while talking to Lois, after he has read whole book. He certainly should have found it earlier, during the reading.
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Bruce plays Admiral Firmus Piett. However, when the probe finds the Rebel base, he already has the admiral insignia even though he was still a captain.
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Music:
Where Have All The Cowboys Gone? by Paula Cole
Turn The Beat Around by Vicki Sue Robinson (with reworked lyrics)
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Quagmire's dad was a big part of his life growing up, but in Fore Father, Quagmire tells Chris he didn't have a dad.
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Music:
Walking On Sunshine by Katrina & The Waves, sung by Peter
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Quagmire's front door swings different ways throughout the episode. When Joe and Peter come over, the door swings open with the hinge on the right, but when Ida walks into Quagmire's house after Quagmire storms out of dinner, the door swings open with the hinge on the left.
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Tom Tucker and Diane Simmons said there were 5 seconds left then Peter came in and the family were talking. Tom and Diane then began to countdown from 10 seconds.
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Stewie claims that "Ring Around the Rosie" is a song in reference to the Bubonic Plague. This is a widely held misconception.