The movie was originally going to be titled Hot Tub Time Machine 3 as a joke about the time travel but the studio would not allow that, claiming it would be too confusing.
The original release date was scheduled for Christmas of 2014 but, after The Interview (2014) was moved to that date by Sony, it was moved to February 20th, 2015 to avoid competition.
All references to the years "2014" and "2024" were dubbed to "2015" and "2025" (It was originally supposed to be released Dec. 2014, but ultimately came out Feb. 2015)