Errors including spoilers before surprise appearances, ill-timed remarks, reference to the Peter Pan character Captain Hook as Captain Cook and Abraham Lincoln as a prime minister of the United Kingdom.
In an interview at the 2007 Wizard World in Los Angeles, co-executive producer and writer Jesse Alexander said that all the stories in the experience "connect with the show" and provide participants with real spoilers.
In a similar vein, on Crosswords, the two competing contestants are joined in the second round by three "spoilers" who can replace one of the main contestants if they ring in and answer correctly.
SModcast Pictures produces the unscripted television series Comic Book Men, as well as the Hulu-exclusive series Spoilers.
On July 17, 2007, Goldberg was sent a string of letters and phone calls from lawyers representing Scholastic threatening legal action if sites revealing spoilers for Harry Potter and the Deathly Hallows were not removed, in response to several YTMNDs with scanned pages that Goldberg posted on the front page.