- Broken Base: The comics had their writers changed after the seventh album. Whether the next albums are still enjoyable stories or inferior to the original ones is a bit of a touchy subject. This wasn't helped by the fact that the storyline of the series was pretty much finished in the sixth album, and the eight one served as a reboot of the series, having old and familiar characters but creating new adventures. This died down a little when the ninth album was released, as it demonstrated that the new writers could come up with some good and interesting plots as well.
- The seventh and eight albums in general are the ones that sparkle the most discussions because they are little more than collections of stories and, in the case of the eight one, besides being a reboot, is also a rehash of some of the older stories. They are not considered terrible, just much more weaker than the older ones and the ones that follow them.
- Growing the Beard: Many who read the albums seem to agree that this happened starting with the fifth album, where the story and the atmosphere got much more darker and with many twists.
- What Do You Mean, It's for Kids?: Pretty much the reason Billy's origin was changed in the cartoon. The entire premise is about a child getting killed by a car and reincarnated as a cat. There are also some occasionally scary parts, including animal experiments and, when Sanctifer is involved, animals getting killed.
- Badass Decay: Sanctifer goes from a huge, frightening, villainous tomcat to reluctant friends with the main cast.
- And that is nothing compared to how he was overall changed from the dangerous and sociopathic cat he was in the comics to a bully that, in the end, was never that much of a threat.
- Broken Base: Is the series fun and enjoyable in its own right, or a very poor and messy adaptation that cannot even compare to the comics? You decide. It didn't help the fact that many things were changed for it, and both its stories and its atmosphere were quite toned down for younger audiences.