Fans were devastated after The Big Bang Theory came to an end a few months ago in a tear-jerking final episode.
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In the two-part finale entitled “The Change Constant” and “The Stockholm Syndrome,” viewers witnessed Amy Farrah Fowler (played by Mayim Bialik) and Sheldon Cooper (Jim Parsons) win the Nobel Prize.
Fans will remember the wholesome ending that saw the couple overcome their anxieties and accept the award.
Amy finally rose to the occasion despite her reservations about being only the fourth woman to win the prize.
However, the episode also had some sentimental touches that fans may have missed.
Fans who tuned into the final episode will have noticed the final version of the theme song played in the last episode was different to the usual one that kicked off every episode of the other twelve seasons.
Showrunners revealed the original band named Barenaked Ladies returned to the studio to record a special acoustic version to close the final chapter of the show.
Producers Chuck Lorre and Bill Prady reached out to the band ahead of the last episode to share a new take on the song with fans.
This made a touching send-off to the 12-year long show which fans and cast will look back on for years to come.
However, this is not the first time showrunners gave the show a sentimental touch.
Penny had quite the array of friends by the time the show ended, creating close bonds with the crew since episode one.
Her unlikely friendship with the science enthusiasts became a focal point of the show which developed as she became closer to Leonard (Johnny Galecki).
But as the seasons went on Penny became extremely close to both Bernadette Rostenkowski-Wolowitz (Melissa Rauch) and Amy Farrah Fowler.
Despite the pair not arriving until later on in the show, they quickly teamed up with Penny and made an iconic trio.
The waitress even found herself becoming attached to all of the guys’ friends with Leonard Hofstadter (Johnny Galecki), and this was proven in a number of shots from seasons 11 and 12.
During scenes in Penny’s apartment, viewers may be able to spot a number of photos on her fridge of Penny with members of the cast.
Penny is visible with Leonard, Amy, and Bernadette, as well as some people from behind the scenes of The Big Bang Theory.
She is also pictured with some members of the crew, who kept the series going over the years.
The Big Bang Theory season 12 is available on CBS and All4.