Tanner in "Sacrifical Lamb Mode" originated on the Groundlings Stage during the writing lab showcase "LABrea Tar Pits", October 6, 2024.
Mitch, in "Cuffed Together" originated in "Cool Parents", a live sketch written by T.C. De Witt and Jessie Guthrie for the Groundlings writing lab showcase "LABrea Tar Pits", October 6, 2024.
After conceptualizing the finale, T.C. De Witt did all 31 characters from the series in 5 hours, including doing makeup again for Sophie. The entirety of this is documented in a time lapse during the closing credits of the final entry.
In episode 15, Joel mentions his brother Mars and sister Haley. In episode 28, Darren is scolding his kids, which are Joel, Haley, and Mars.