A lot of the time they're just making the citation up. Wikipedia's page on French toast says this:
> The earliest known reference to French toast is in the Apicius, a collection of Latin recipes dating to the 1st century CE, where it is described as simply aliter dulcia 'another sweet dish.'[8] The recipe says to "Break [slice] fine white bread, crust removed, into rather large pieces which soak in milk [and beaten eggs] fry in oil, cover with honey and serve".[9]
The problem is that the reference to eggs doesn't exist in the Apicius. It comes from an "augmented translation" that was written in 1936; the eggs are original content from that "translation". The sidebar's claim that French toast originates in the Roman empire is a lie, and so is the claim that French toast appears in the Apicius.
This has been noted on the associated talk page forever, but (apparently) so what?
More on the obscure end of things, I'm also annoyed by the page on Chen Shimei ( https://en.wikipedia.org/wiki/Chen_Shimei_and_Qin_Xianglian ). It claims that Chen Shimei, a stock dramatic character which the page itself dates to 1594, is represents an attempt at character assassination against an official of the Qing dynasty, which began in the mid-17th century.
The claim (that the fictional character is based on a historical person) used to be cited to a newspaper article which did not itself cite anything. That citation has since been removed, but the claim lives on in the page without even a fig leaf citation.
