It would be impossible for the scientist (Dr. Stephen Jay Gould PHD)to do a DNA test in the 24 hours that he promised Lisa Especially in 1997 even today it would likely take at least 3-5 days to get results back also the human Genome wasn't finished being mapped until 2003 and If this was truly a fossil it would be unlikely that they would find DNA at all even(the scientist would've known this) with today's technology in 2020. Though I guess the scientist never intended to do the test so maybe he did know all of this and was just humoring Lisa.
The scene in Judge Snyder's courtroom where Lisa is put on trial for stealing the skeleton is seen as a reference to the 1920s Scopes Monkey Trial in Dayton, Tennessee, which dealt with issues of separation of church and state and the debate between creationism and evolutionism. It would also be referenced in the episode The Monkey Suit.
The publicity stunt created by the mall developers in the episode has been compared to scientific hoaxes such as the Cardiff Giant and the Piltdown Man.
At the end of the episode, when Lisa asks if the townspeople are outraged for being fooled by a publicity stunt, Chief Wiggum is about to answer her, but is distracted when he catches sight of a Pottery Barn in the new Heavenly Hills mall.
The students digging by the sunset and their silhouettes are shown is similar to the scene in Raiders of the Lost Ark when Indiana Jones and Sallah free the Egyptian excavators from the Nazis, and they in turn help Indy. The scene against the sun is when Sallah tells Indy that the workers have found the Well of Souls.
When Jimbo, Dolph and Kearney are digging in the Archaeological Site, their detention slacks are a parody of orange prison transit slacks, but with the word 'Detention' on them. Clearly they were among the students 'punished' with the dig.
In the opening scene when Homer is driving the Pink Sedan, his sailor hat is for one frame drawn in front of the top of the car window when it should be behind it.