Ronnie James Dio never considered the band Dio as a solo project (he said that Dio just seemed like a good band name at the time), but he calls the album "Holy Diver" the first of his solo career.
The Dio band lineup does not resemble any factual lineup the band ever had. The drummer is a blond, bearded man, which the band never had; the only blond to ever drum for the DIo band was James Kottak, and he was only a touring drummer and did not have any facial hair. Additionally, the bass player looks like he is balding; all of Dio's bassists had a head full of hair. Likewise, the guitarist has hair in a ponytail, which no one in the band actually did. It is clear the animators/creators just made "generic" band members without regard to the actual group members.
In the first shot of Cartman lying in bed being 'home schooled', both Terrence and Philip on his wall poster have the letter 'T' on their shirts. When the poster is seen the next time, Philip has the letter 'P'.
Rebecca is asked to spell the word "littoral" at the spelling bee. Though she spelled it incorrectly, leaving out the second "t", the mayor claims she was correct.