- Table read date: February 17, 2017.
- This episode originally aired as an hour-long episode. It was later edited into two episodes with unique credits and with some scenes edited/cut that was briefly made made available on Hulu and FOXNOW in January 2018 before the hour-long version was restored on these services.
- The title continues the series of episodes titled with "The ...ening", following on from "The Deepening", "World Wharf II: The Wharfening", and "The Hauntening."
- These are the first episodes of the show to air in the month of December since Season 5's "Tina Tailor Soldier Spy" and the last episodes to air in 2017.
- The script covers had the subtitle "A Kind of Special Bob's Burgers Christmas Special".
- At the table read, the scripts had a back cover as well as a front cover. The back cover features Charles M. Schultz's Peanuts style drawings of the Belcher Family and several of the recurring characters featured in the episode.
- First episodes where storyboard artist Simon Chong is credited. Chong joined Bento Box Entertainment after being offered a job by Loren Bouchard upon seeing his unofficial Archer/Bob's Burgers crossover.
- Billy Eichner and Tim Meadows are listed on the press release as voicing Mr. Ambrose and Mike the Mailman respectively. Mr. Ambrose is absent from this episode and Mike appears at Linda's party and is seen being questioned during a montage but doesn't have any lines. Meadows probably recorded some dialog which was later cut.
- Dalton Crespin, the brunch blogger from "Brunchsquatch", appears. He appears animated in the show's usual animation style for the first time after being showcased in multiple fan art animations in "Brunchsquatch."
- The music featured in these episodes was recorded at the recently re-opened Sound City Studios in Van Nuys, Los Angeles. Classic albums including Nirvana's Nevermind were recorded at the legendary studios.
- The sign outside the restaurant advertising Linda's party says "BEST HOLIDAY PARTY EVER! FREE SLIDERS AND EGGNOG".
- Tina, Gene, and Louise are seen wearing the Christmas sweaters they wore for the Nice Capades in "Nice-Capades" at the party. Teddy is also seen wearing the Christmas sweater he wore in "The Last Gingerbread House on the Left."
- Gene refers to the El Niño weather phenomenon during Teddy's story about The Bleaken.
- Matt Berninger, lead singer of The National, voices a singer in this episode. He is credited under the name Matthew D. Berninger on the 'also starring' credits. Berninger's EL VY collaborator Brent Knopf arranged all the original songs featured in this episode.
- Olsen Benner references the Elton John song "Tiny Dancer" in her news report on The Wiggle Room's closure.
- This episode's only Burger of the Day, The Ebeneezer Bleu-ge Burger appears for two consecutive days. It is most likely that Bob and Linda put aside much of their business assets to work on solving the mystery of the missing Christmas tree.
- Louise's stocking has been tampered with, presumably by herself. It is been cut in half with the two halves joined together with a new band of material to make it even larger.
- The streets Garfield, Jackson, and Johnson are all names of former U.S. presidents.
- Gene refers to Santa as Lord Santa in a scene, a previous reference to "Father of the Bob" when the kids call Santa this in their Christmas prayer to him.
- The EDM (Electronic dance music) songs being played at the rave were produced by house and techno DJ Cesar Cardoza (aka Robert Download, Jr.).
- Among the decorations at the underground rave is a dreidel, referencing that the Jewish holiday of Hanukkah is also in and around Christmastime.
- When Teddy is standing outside in the blow-up Santa, one of the people who walks by is the DEA agent from Bob Fires the Kids who buys "blueberries" from Tina.
- Both Gene and Louise's dancing during the end credits appears similar to the way they danced in the Sleater-Kinney music video for "A New Wave."
- Andrew Joslyn's musician credit is missing from the hour-long version's credits. It appears on the individual credits for Parts 1 and 2.
- The credits for "Do You Hear What I Hear" is missing from Part 2.
- The brim on Mike the mailman's Santa hat is colored red instead of white in the overhead shot of the restaurant party.
- When Jimmy Pesto and Trev arrive at the restaurant and when she is shown leaving the restaurant Janine's glasses are colored black.
- When Linda gives Dalton the glass of eggnog, Janine's glasses cord is mostly missing and is cut off just above her mouth.
- When Janine is leaving the restaurant she walks in the direction of the Store Next Door. Janine's store and presumed residence is Yours Truly Stationery which is located opposite It's Your Funeral Home & Crematorium which is on the other side of the restaurant to the store next door. It's also possible she could have been heading somewhere else first.
- When Linda says "Mort's back on the list", she erases Jimmy Pesto's name. She should have erased Mort's crossed out name and then rewritten it.
- During "The Art Song", the artist that was behind Linda was miscolored brown with white hair until Linda apologizes on behalf of the intrusion.
- Dalton's freckles disappear when the light from his smartphone is shining on his face at the rave.
- When Teddy says "It all started earlier...", the belt around Bob's chest appears over his arm and is skin-colored.
The original hour-long unabridged version of this episode has several scenes that were edited/cut from the individual Parts 1 and 2. They are as follows;
- A short scene where Louise comments to Gene and Tina that she feels the Bleaken may be coming appears after Linda's conversation with Dalton at the party.
- A scene with Calvin Fischoeder appearing on Mort's surveillance camera ahead of Mort's appearance on the camera. The removal of this scene effectively removes the character from the episode.
- Bob and Linda have a short exchange of dialog before they enter Reflections in a close-up shot whereas they enter the store in the long-shot before where they started their exchange in Part 1.
- Edith says "Good, get out, leave, and take your cookie tray" in the hour-long version but in Part 1 she doesn't say 'leave'.
- A montage immediately follows this line with Linda and Teddy singing "O Christmas Tree" over it with amended lyrics. This scene is recycled into a unique end credits sequence for Part 1 using animation from the deleted scene with "O Christmas Tree" sung by the singers.
- The scene where Teddy inflates his inflatable Santa with him inside it appears between where Part 1 ends and Part 2 begins. It is moved into where the next commercial break in the hour-long version was for its appearance in Part 2.
- Gene comments about the rave saying "This is what I thought a rave looked like, but it is not what I thought a rave smelled like."
- The end credits sequence is longer than the version used for Part 2 with Mr. Present and Mrs. Chang also appearing and a longer version of "Twinkly Lights" with extra lyrics.
- Dana Janssen - drums, vocals
- Tim Dacey - various
- Brent Knopf - vocals, arrangements
- Jon Natchez - flute, vocals
- Kelly Pratt - horns, wind arrangements, vocals
- Matt Sheehy - guitar, vocals
- Andrew Joslyn - strings, string arrangements
- Jessica Childress - vocals
- Elizabeth Ellison - vocals
- Moorea Masa - vocals