- This topic is not unique to Teenage Mutant Ninja Turtles, and its in-story notability may be too oblique for it to have its own complete article on Turtlepedia. For more information on this topic, see its corresponding article on Wikipedia:
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- Though not directly referenced by name, a fictionalized version of the Manhattan neighborhood of Chelsea appears frequently in the IDW continuity, as it is where Foot Headquarters are located. To those familiar with New York City geography, the Foot HQ's location in Chelsea can be inferred from its position on the Zones of Criminal Control maps published during the City at War story arc.
- In addition to the damage Chelsea sustained along with the rest of Manhattan during the Earth Protection Force–Triceraton war during the Invasion of the Triceratons story arc, the neighborhood surrounding Foot HQ was severely damaged even further by the Dragon's brief rampage and subsequent death throes during issue #100: City at War, part 8.
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