Amelia mentions that, in the new reality, Cervantes never published the Quixote. However, when entering the office of alternate Ernesto, a statue of Don Quixote on horseback is visible in the background.
It is stated that, in the modified time-line, Salvador Dali was eliminated. Yet, when Alonso enters his apartment to meet alternate Elena, a copy of Dali's painting "The Persistence of Memory" is visible behind him.