This marks Mia Sara's return to acting since 2013. She had retired but told filmmaker Mike Flanagan she would return to acting for him after watching Midnight Mass (2021).
On-screen debut of Cody Flanagan, who plays 7-year-old Chuck in Act 1. He is director and screenwriter Mike Flanagan's son.
The Life of Chuck started filming in Alabama in 2023 during the SAG-AFTRA strike against Hollywood studios. It was allowed to film despite the strike because it was given a waiver under an interim agreement program that allowed independent productions with no direct ties to members of the Alliance of Motion Picture and Television Producers to shoot.
When Sam says that a day actually lasts twenty-three hours and fifty-six minutes (plus a fraction over four seconds) he's referring to the sidereal day rather than the solar day.
The sidereal day is the time taken for the Earth to rotate 360 degrees, which is indeed less than twenty-four hours. However, during this time, the Earth will have progressed in its orbit round the sun. It will therefore need to rotate slightly further to bring the sun into the same alignment. This extra time accounts for the difference between the sidereal day and the solar day.