|Location of Publication||New York, New York|
|Story Location||New York: New York City; Baxter Building, Long Island, Fifth Dimension: Gomath (First appearance), Earth-721 New York City|
|Notes||Continuity Notes: |
The training room used by Reed in this story is based on Danger Room technology provided to the Fantastic Four by Professor X of the X-Men. The narrative of this story suggests that Reed is unaware that Xavier is a mutant or part of the X-Men. However it has since been stated that Richards knows this to be true, as shown in X-Men First Class Vol 2 #1 which took place just after his marriage to Sue in Fantastic Four Annual #3.
Reed confirms that he his slowly losing his stretching power, something he began to suspect that he was going on in Fantastic Four #157. Reed ultimately loses his powers in Fantastic Four #178, but later has them restored to their peak in Fantastic Four #197.
Johnny goes to the Long Island swamp that can transport one to the Fifth Dimension, as it was first seen in Strange Tales #103. This story references The Human Torch #3, which was a reprint of the Strange Tales story and was referenced as it was published around the time of this issue.
Some facts about Earth-A:
That reality is indexed as Earth-721 as per Official Handbook of the Marvel Universe: Alternate Universes 2005.
That world depicts Nelson Rockefeller as President of the United States in that reality. This should be considered a topical reference per the Sliding Timescale. As Earth-721 is an alternate reality of Earth-616, it is subject to the same rules of the sliding timescale. This is more so the case since Rockefeller died in 1977.
That said, in the real wold Rockefeller failed to obtain nomination for the Republican presidential bid in 1968. When Richard Nixon resigned following the Watergate scandal, he was replaced by Gerald Ford and Nelson Rockefeller became Vice President.
Ben states that "his" president is Gerald Ford. Which also should be considered a topical reference per the Sliding Timescale of Earth-616.
There are two in-jokes pointed toward Marvel's rival competition, DC Comics in this issue, they are:
Ben asks his Earth-721 counterpart if New York City is called "Bigville" or "Cosmopolis". This is in reference to the fact that the DC Universe's version of Earth there are a number of fictional cities that are analogues for New York such as Metropolis and Gotham City.
The narrative of this story refers to Earth-616 as "Earth-1" and then goes "(ooops! wrong comic-mag!)" At the time of this story the DC Universe had a multiverse where each unique universe was identified, usually with a number. They are referencing Earth-One, the mainstream DC Universe that was in use at the time. Marvel did not start numbering their alternate universes until Daredevils #7 when the mainstream Marvel Universe was first identified as Earth-616.