[1][2] Speaking in 2020, Raiff described the plot as following two siblings and their single dad who is making them grow up too fast.
[3] Speaking in 2020 to Screen Daily, Cooper Raiff said he had been writing the script for Hal & Harper for "a long time".
[5] The series is produced by Bad Bangs LLC and obtained an interim agreement to continue production during the 2023 SAG-AFTRA strike.
Raiff is also producing through Small Ideas alongside Clementine Quittner.
[7] In January 2024, lead actress Lili Reinhart shared photographs from filming on her private Instagram account.