Continuity mistake: During the number "Little Black Dress," Bert Schnick pulls out a bowl of caviar and eats a bite of it. In the process, the sticky mess gets on his lips, hand, the table, and an adjacent dish. The next shot that we see him in, the mess is completely gone and he now seems to be eating a wafer.
Continuity mistake: Right before the premiere of Faith Factory, several characters are found in the room above the audience discussing some things. As Neely interviews Farley Flavors, we see Nation pouring champagne in the corner. In the next shot, they all have champagne and the bottle is gone from her hands.
Other mistake: Towards the end when Janet, Brad, Oliver and Betty are singing "We're going to do it anyhow," as they are dancing down the aisle, Betty very visibly trips and grabs Oliver to stop from falling over.
Deliberate mistake: In the first shot, we see Farley Flavors sitting in what looks to be an editing room, smoking and waiting for the show to start. As we pan out, we continue to see him smoking, through a giant heart shaped window. A few moments later, we see the same heart shaped window, only now with a red screen over it.
Revealing mistake: When Betty and Oliver go to the coffee stand, immediately after Betty says "Plus one," you can see that the guy working the stand just grabs two cups from his stand without pouring coffee into them and gives it to Betty and Oliver, who drink from the empty cups.
Other mistake: During the 'Little Black Dress' number, look carefully at Cosmo's plans for the dress, they read 'The Brad and Janet Show' as this was to be the original title of the film. It doesn't really fit for Shock Treatment because the show being planned is only Janet, Brad is locked in a cage.