Errors:
Why would Krusty be in a steam bath if the sign says that overweight people and people with heart conditions shouldn't be in the steam room? As we learned in "Krusty Gets Busted" (coincidentally the first Sideshow Bob episode), Krusty had a pacemaker installed after suffering a heart attack while advertising pork products on his show.
Why didn't Maggie have an extra pacifier with her in the vacuum cleaner bag? We've seen on a number of occasions that she has an extra somewhere in that blue sack she wears. (For that matter, why would Marge think anything suspicious when she sees a pacifier on the floor, considering how many pacifiers Maggie has?)
Sideshow Bob didn't seem to be upside down when they first showed him in his cell.
DYN:
... Marge apparently gives Maggie a pacifier that was on the floor? ... this episode is set in February, which is when Mardi Gras occurs? ... Homer eats the card from Patty & Selma, as well as the bills? (These newspapers are filled with essential inks!)