Visible crew/equipment: When Lamont is chewing Fred out about the auction, over his shoulder you can see a stagehand crossing through the open kitchen door.
Continuity mistake: When Fred takes his plate from one room to the next, they switch from a small object on the plate in the living room to a full size Danish when he walks into the kitchen screen.
Continuity mistake: When Fred puts the Turkey back on the table, the bowl of stuffing falls to the floor. The bowl is back on table while still talking to Lamont.
Revealing mistake: Fred is reading from "The Joanna Rhodes Beauty Book" and the title is shown on the dust cover. When Fred tilts the book, though, the words "Winston S. Churchill" are visible on the actual book under the dust cover. Also visible is the script from which the actor is reading, tucked inside the book and held by clips.
Audio problem: During the dream sequence, while the spirits of Christmas uses echoing sounds in their voices periodically, Fred's voice was not supposed to echo at all, but his voice can be heard echoing as well a few times.
Visible crew/equipment: As Bruinhilda starts to come out to do her number, the shadow of the boom mic is on the wall.
Factual error: During the meeting with American prisoners the lone woman says she's fought in both the European and Pacific theaters. Unless I'm mistaken, nobody got shipped from one to another during the war unless one theater was done.
Other mistake: Near the end, after Fred says, "If you take my hearing, you might as well take all of me, " Lamont turns off the lights by flipping the light switch up. A moment later, Lamont turns the lights back on by also flipping the light switch up.
School Daze - S6-E24
Continuity mistake: Fred tells Lamont he quit high school to support his parents but in Season 1 Episode 5 A Matter of Life and Breath he told Lamont he'd quit school at age 10.