Chip is apparently not rich despite what many of his fans assume. The record company, in reality, pays for all the expensive stuff he has. Chip claims that if his fans find out he is not rich they would not like him anymore.
This episode was postponed on March 1, 2002 in the U.S., but it was aired in Australia on August 3, 2001 because the Americans had postponed the 2nd season of "The Fairly OddParents".
When Cosmo stalls the fans at Chip's concert, everyone sees him as a fairy and this clearly breaks Da Rules: no one must reveal fairies' existence.
However, it is possible that Cosmo didn't technically break the rule as he did not directly say that he was a fairy (not including when he said the name of his band) despite appearing as one. It may have been because of his appearance people may have thought he was a musician in a costume with his other band members also in costumes.
When Timmy splashes out of the cake it makes no sound.
When Timmy wakes up, it's morning. When he goes downstairs, he expects dinner. In reality, he should be expecting breakfast.
Chip Skylark has a different appearance on his posters and CDs than he does when he appears in person. It could be possible that an earlier character design was used for his merchandise.
Vicky: Move it twerp! It's pay-per-view, which means if I don't view, then someone's gonna pay!
Timmy (about Chip Skylark): I wish something bad would happen to him!
(Cosmo and Wanda poofed Da Rules in front of them and read what bad things Timmy could not wish for to happen to Chip Skylark)