Summary
The Big Bang Theory finale featured a time jump that tied up loose ends and held sentimental significance for the show's overall run.
The time jump facilitated crucial plot advancements, including Sheldon and Amy's Nobel Prize triumph and the surprising revelation of Penny and Leonard expecting a baby. Despite ongoing discussions amongst fans, the time jump was an indispensable element for the ultimate twist and would not have been possible without it.
The conclusion of The Big Bang Theory included a significant time jump, adding depth to the show. In 2019, CBS aired a special extended series finale, bringing the story of the Pasadena group to a mostly satisfying conclusion. Sheldon and Amy were awarded the Nobel Prize in Physics, Leonard and Penny were expecting a baby, and the rest of the group found contentment in their own lives. The finale concluded with all of them gathered in Apartment 4A, sharing a meal as they typically did.
Although The Big Bang Theory finale received positive feedback for tying up major storylines, there were still unanswered questions surrounding the two-part ending. One enigma was the unexpected time jump between the episodes "Change Constant" and "The Stockholm Syndrome." In Jessica Radloff's book, The Big Bang Theory: The Definitive, Inside Story Of The Epic Hit Series, Johnny Galecki provides insight on the significance of the 139½-hour gap, which references the overall duration of The Big Bang Theory. See his complete statement below:
Why The Big Bang Theory Finale Needed A Time Jump
The total count of television hours we had created was astonishing. Due to the overwhelming emotions, the exact details escape my memory, but one thing for sure is that I didn't reconstruct the setup after every take. Thankfully, our prop masters were there to save us from the agony that would have ensued.The time jump in The Big Bang Theory holds a secret and touching meaning. It also highlights the show's tendency to pay subtle tributes, such as Penny wearing the same shirt from the pilot episode in the final shot of the finale. Despite some arguing that the time jump was unnecessary, it was actually essential for several reasons.
The time jump in The Big Bang Theory allowed for a separation between Sheldon and Amy learning about their Nobel Prize win and the actual ceremony. Additionally, the time jump played a crucial role in the surprise plot twist involving Penny and Leonard revealing their pregnancy after years of marriage. While this development has divided fans, it wouldn't have been possible without the forward flash. It has been over four years since the show ended, and although it may not be enough time for a revival, there are already demands for a cast reunion, similar to the Friends special. Currently, it is uncertain if any of the original cast members will be part of the new spin-off that is in progress, but the franchise is set to expand beyond just Young Sheldon.
Source: The Big Bang Theory: The Definitive, Inside Story Of The Epic Hit Series