The is the first episode produced for the 7ASA production season and was the first to premiere.
The title of this episode is a reference to the 2012 movie, Zero Dark Thirty. The "LARP" part of the title is the acronym LARP, which means Live Action Role-Playing game.
Tina says that "Winthorpe Manor is the American Downton Abbey", the script cover image is a parody of Downton Abbey. (see Zero LARP Thirty/Gallery).
The opening sequence from this episode on is slightly different with the glass in the restaurant's front windows being fully transparent as opposed to slightly opaque before.
Fox's press release for this episode lists LARP as if it was a word in the title with only the initial letter capitalized. All letters should be capitalized in LARP as it is an acronym.
Teddy babysits the kids for the second time in this episode, he previously did so in "Uncle Teddy"
The bells in the servants' quarters from left to right, top to bottom, are; Granthom, Cicily, Humphrey, Fiona, Mr. Winthorpe, Mrs. Winthorpe, Jacqueline, Preston, Avery, Dining Room, Sun Room, Lib-(obscured by a lamp) Library Hall, Smoking Room, Front Door, Back Door, Study, Drawing Room, and Grand Entrance.
Some Like it Pop Old Timey Soda Shop from "Gayle Makin' Bob Sled" appears when the kids are taking Teddy to Dr. Juarez. Another store named Smoothie Criminal appears as well.
A total of 1.58 million households watched this episode.