Grey Dawn/Trivia

Continuity

 * "Mostly hippies go to farmer's markets. Mostly" - harkens back to "Cat Orgy" and Aliens
 * USGS, from "Volcano." Randy is made aware of something going on outside once again.
 * Randy's line, "That's our Grandpa" and the ensuing laughter echoes Stan's line in Death, "That's my silly grampa." After that line, the family laughs.
 * In the news theme, there are clips from: "Two Guys Naked in a Hot Tub", "Tooth By Fairy Tats 2000", "Simpsons Already Did It", "A Ladder to Heaven", "Red Man's Greed", and "Christian Rock Hard".
 * The Buick driven by the senior citizens in the lake scene is exactly like the one driven by the visitors in "Cancelled"

References to Popular Culture

 * The restaurant that all the elderly eat at is named Country Kitchen Buffet, which is a combination of the names of two similar restaurants; Country Kitchen Restaurants and Old Country Buffet.
 * The topical reference of this show is George Russell Weller's fatal car accident at the Santa Monica farmer's market in July 2003, in which he killed 10 people. The car Weller drove, a Buick LeSabre from 1992, is also featured in the episode, as the car which killed a man who was fishing when the car was driven off a bridge. This scene also parodies the movie Jaws, using the theme music from the movie.
 * The title of this episode and many of its scenes are a parody of the 1984 movie Red Dawn. Specific examples include the AARP troops parachuting into the town while Mr. Garrison lectures his class on Genghis Khan and sees them outside the window. Also many of the townspeople rounded up and held inside a prison camp, with Stan's dad talking to the boys through the fence and shouting "Avenge me!" Red Dawn also toke place in Colorado.
 * The sequence where a convoy of elderly drivers are seen approaching (with Randy shouting for the boys to get off the road) references a sequence in John Carpenter's 1983 film adaptation of Stephen King's Christine, with similar staging and music to this scene where Christine chases a victim at a slow pace before running him down.
 * Stan's grandfather states that he is "mad as hell", which is a reference to the 1976 movie Network.
 * The Buick driven by the senior citizens in the lake scene is exactly like the one driven by Ted in "Night of the Living Homeless".

Goofs

 * Randy and Sharon both called Marvin Marsh "dad," even though Randy is Marvin's birth son. Sharon, however, could be speaking in the sense that Marvin is her father-in-law.