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.
It is impossible for the Springfield citizens to think that the skeleton was that of an angel, since angels are divine creatures, thus, they can't die. However, the Springfield citizens proved themselves many times to be naive, if not stupid.
Lisa was arrested for destroying the angel, however she is only 8, therefore she would be below the age of criminal responsibility in almost every state. The authorities in Springfield are not understood for being particularly ethical.
Towards the beginning, when the Simpsons stop at a stoplight, the car's front wheels are slightly in front of the stopping line. However, in the next shot, the car is totally behind the line.
When Stephen Jay Gould assures Lisa that he can perform a DNA test, his teeth are colored gray for a frame.
In the Simpsons' garage, Charlie's glasses are white instead of aqua.
When Lisa and Marge argue about the existence of angels, the bottom of Marge's beads is briefly flat.
While the angel supporters are wrecking the museum, Moe is crushed by a mammoth tusk and claims to be paralyzed. In the very next shot, Moe can be seen in the mob heading toward the laboratory.
When the "angel" ascends into the air, Carl is colored yellow.
When everyone goes to the Heavenly Hills Mall it is completely dark, however it was merely minutes after sunset.
During the scene where all the Springfield residents head to the Heaven Hills Mall, Maggie's bow is missing.