These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Harsher in Hindsight: Jack's track injury sidelines him for the season, and at first one is inclined to believe that usual teenage Wangst will be the only result...until the documentary from the future reveals that this injury gave Jack recurring pains in his knee; during the War of the Americas, he was unable to outrun enemy fire due to this recurring problem, resulting in his death.
Retroactive Recognition: Oddly enough, of a character name. Robert McCallister, moderate Republican...sound familiar? Rob Lowe's character on Brothers and Sisters was given the same name and political ideology due to the show being made by the same creators, including producer Greg Berlanti, who never got to fully explore Bobby's political career due to Jack & Bobby being canceled. That being said, the Brothers and Sisters version of Bobby drops out of the presidential race. And also, he's running in the present day (i.e. the early 21st century) rather than the 2040's.