The shade on the living room window by the staircase is completely down during the breakfast scene when Archie comes into the room. Moments later, when Edith is arguing with Archie, it is raised all the way and the sunlight is visible, even though no one has gone by the window.
Shortly after Veronica reveals the true nature of her relationship with Liz, Edith says "That don't affect the brain, does it?" The camera angle then changes, and the shadow of the boom mic is visible to the left of Liz's head, then it moves upward and out of the screenshot.
Cousin Liz and Veronica's apartment appears suspiciously similar to the Jeffersons' East Side Condo!
Who are the "guests"? The only one we recognize is Sybil Gooley. Where are the Jeffersons or Lorenzos or Cousin Maude or Cousin Amelia or any of Edith's other friends or relatives who surely would have attended her 50th birthday party. (Of course it would have been too expensive to get everyone, but a few more familiar faces would have been appreciated).
Nitpick – Archie says that Gloria was nearly attacked by the construction workers three years ago. While certainly it's normal to fudge on the number of years that something like that happened, that incident actually happened four years earlier (in the 1973 episode, "Gloria the Victim").
If you look carefully at the scene where the customers come into the bar for the opening, a couple comes in at the beginning of the show, they are celebrating their anniversary. The wife has NO speaking role, and therefore she is not mentioned in the credits. However, she is none other than Doris Roberts (who many years later starred on Everybody Loves Raymond.) Ironically, Doris Roberts HAD been on an earlier episode of All in the Family, with a short, credited speaking role, two years earlier, Season 6, Episode 24 "Edith's Night Out", as a bar patron in the same bar before it was owned by Archie.
The two Klan leaders' names, "Gordy Lloyd" and "Mitch Turner", are obviously based on Lloyd Turner and Gordon Mitchell, two writers who had worked on previous AitF episodes.
Anachronism: In the kitchen scene of Mike and Gloria's flashback, Gloria takes a box of Arm and Hammer baking soda out of the refrigerator. The box has a UPC barcode on it. These were not on American grocery items circa 1969, the time of the flashback.
Notice in the flashback scene how the front walls of the Bunker house still have the new wallpaper that Edith had put up after the house had caught fire near the end of the previous season.
Goof: After Beverly kisses Archie, the lipstick print changes shape and position on Archie's forehead in between shots. In the first shot, it is nearly at his hairline. Later, it has moved down on his head.
Edith's Crisis of Faith Part II, (written by Mel Tolkin, Larry Rhine, Erik Tarloff) was nominated for an Emmy Award for Outstanding Writing in a Comedy Series.
It seems strange that Little Joey wasn't present at the Christmas dinner. Did they leave him all alone at home?
In this episode, there's a banner on display in Archie's bar announcing the teams: it's Dallas versus Denver in Superbowl #12
Although the butcher tells Edith his first name is Albrescht (Al for short), the credits at the end of the episode list his first name as Alvin.
This episode consists on one continuous scene inside Archie's Place.
Archie's brother, Fred, suddenly appears after years of estrangement, but in "Archie Finds a Friend" Archie says that he's an only child, and in "The Saga of Cousin Oscar" Archie says that he has a sister, Alma, and a brother named Phil.
Archie and his brother recall their father's funeral 29 years earlier (circa 1949). However, in "Meet the Bunkers," Mike talks about a visit from Archie's father "about a year ago" (or 1970).
Edith reveals that Mike's new salary as an associate professor will be $21,800.
George still had his cleaning store in Queens (one of the seven in his empire) so it was not a stretch for him to come over to the Stivics' house. Besides, it made a great crossover-too bad we never saw the Bunker's visit the Jefferson's new apartment (in the sky).
Why did George return to Queens just to visit the Stivics, which by the way, he stays there for less than 5 minutes and then leaves, when he could've just called about the house being bought?
So, maybe there's a reason behind it, but anyhow, if he had to leave so sudden, why did he accept Gloria's peice of cake, which he didn't take a bite of and that Archie wanted anxiously?