"Amor Fati" is a Latin phrase referring to the "love of fate," which is an important phrase and concept in the work of the German philosopher Friedrich Nietzsche.
As writers, David Duchovny was responsible for the Mulder alternative life scenes, while Chris Carter concentrated on the mythology plot developments.
At the start of this seventh season, David Duchovny filed a lawsuit against Fox over their syndication of the show, Duchovny contending that Fox had sold the rights to their own FX network when it could have been shopped to other networks for more money. Duchovny's suit claimed that Chris Carter was fully aware of the move. This lawsuit hung over the production for the entire year, only being resolved by the time the season finale was aired (Duchovny reputedly was paid $20 million in compensation). Reportedly during that time, Duchovny and Carter weren't on speaking terms. Ironically in later years, Carter filed a similar lawsuit - using the same lawyers that Duchovny had.
One of the inspirations for David Duchovny in putting together this story was Nikos Kazantzakis' novel "The Last Temptation of Christ".
While Mulder exhibits abnormal brain activity and psychic ability and experiences headaches, Scully will be revealed to do the same in the Season 11 premiere My Struggle III (2018).