This page contains trivia for "Dead Celebrities". Remember, trivia must be factual, provable, and it is always best to cite your source for not-so-obvious trivia. If you would like to dispute a trivia point, please discuss it in the article comments.
According to this episode, Stan apparently has a stronger digestive system than Cartman, or as Cartman puts it, a "golden rectum of the Gods".
While waiting at the Denver's Hospital for Children, Kenny is seen reading a Coco magazine.
Cartman said that they still show Billy Mays' commercials. Mays' commercials actually continued to air after his death, including two new commercials he filmed shortly before his death. His commercials as well as his show, Pitchmen were eventually taken over by his friend and co worker, Anthony Sullivan.
Billy Mays' son, Billy Mays III, has said that he is a huge fan of South Park and was proud of the portrayal of his father in this episode, finding it tasteful and funny. 
Although she is introduced as Dr. Philips, her badge clearly reads "Dr. Tangina" in reference to her character from the film.
Dr. Philips description of purgatory--and the fact that purgatory really "is" an indefinite stay on an on-runway airplane--bears a striking resemblance to The Hitchhiker's Guide to the Galaxy, The Secondary Phase (copied in the second book, The Restaurant at the End of the Universe) when one of the lead characters comes across a seemingly abandoned spaceport on a practically dead planet, with one functioning aircraft that kept its passengers in stasis, its robot flight attendants waking them up once a year to feed them, despite their restraints, and then put them back to sleep, while they waited indefinitely for their supply of lemon-soaked paper napkins.
When Billy Mays is trying to sell his products in Purgatory, he is seated next to Kennedy and Richardson and behind some background characters. At the end, when they land in Hell, he is seated next to someone else. At the part where all the celebrities yell, Mays is no longer present.
In the scene where Cartman shows them Mays selling a product for cleaning blood stains out of underwear, they start out in Cartman's house when they go to the TV. However, when they go back to see the boys' reaction to the commercial, they are in Kyle's house.
In a deleted scene, viewable on the Season 13 DVD and Blu-ray, where the boys and Michael Jackson (in Ike's body) were in Forest Lawn Memorial Park Cemetery in Glendale, California, the tombstone shows a death date of 25 July - Jackson actually died on 25 June. However, many people believed this to be a clue that Jackson is alive.
The male doctor says he will let Dr. Phillips take care of it, but the woman's tag says, "Dr. Tangina."
At the end when Michael Jackson gets on the plane Patrick Swayze can be seen seated on the far left. He disappears and reappears between subsequent shots.