When the boys go to see Mr Hankey at the mall in Nebraska, characters who should be back in Colorado (in South Park) can be seen in the crowd of children, including Butters, Craig and Token.
When the family and friends are seated at table, Kenny sits between Kyle and Great-Grandma. But when Kyle holds Great-Grandma's catheter bag, Kenny is no longer between them. He's back between them when the camera shows the whole table again.
Long shots of the dining scenes show Cartman wearing his coat over his new shirt. Close-ups show him with his coat off.
When Howard and Manson break into Grandma's basement the TV has three cracks on the screen glass, and this is the case until Manson turns on the TV the next day.
When Manson walks past the bookshelf in the cell "Observations from the Forest" is much smaller than "Are You There God? It's Me. Manson," but when he goes to bed, "Observations from the Forest" is bigger than "Are You There God? It's Me. Manson."
Charlie Manson is incarcerated in Nebraska State Penitentiary. Manson has been incarcerated in California State Prison, Corcoran since March 1989.
The last two acts of It's a Wonderful Life (1946) are reversed in the spoof Manson is watching. Bailey's walk through Main Street should precede his realizing that Mary is real.
Manson's smiley face tattoo briefly changes into an alien head while in the car. Given the show's creators' propensity for hiding aliens in the backgrounds of various scenes, this is almost certainly an intentional joke.
A book written by Charlie Manson is attributed to "Charles W. Manson". Manson's middle name was Milles. However, according to prosecutor Vincent Bugliosi's book "Helter Skelter", Manson unofficially changed his middle name to Willes, so if said slowly his name would sound like "Charles' Will is Man's Son".
At the end when everyone is singing "Hark the Herald Angels Sing," they skip the verse: "With angelic host proclaim/Christ is born in Bethlehem."
When a reporter is informing the public of Charles Manson's "hostage" takeover inside of the Cartman residence, he says, "this live hostage crisis is brought to you by Palmoral Sun Block. Remember, if it isn't Palmoral, you're gonna get cancer." At the same time on screen, Palmoral's motto is in bold letters, only instead of saying "you're gonna get cancer" it says "your gonna get cancer."