Looking for offspring of Plumbers, Ben looks at Kevin's Plumber's badge and says it'll show them the locations of another Plumber, or at least another Plumber's kid. Though the opposite would be more true, it wouldn't be completely true either. Kevin's badge could POSSIBLY lead them to a Plumber's offspring, or to another Plumber (or to his/her identity), but "at the very least" Kevin's badge will simply lead them to another badge.
In the 12 times a name for ChromaStone appears among the Ben 10: Alien Force credits, this is the only time it appears with an O instead of an A (and the first of only two times the S is lower case).
In the 22 times a name for Humungousaur appears among the Ben 10: Alien Force credits, this is the first of two times it appears spelled with an O instead of a U (Humongousaur). It is the first of three alternate spelling appearances.
In the 18 times a name for Jet Ray appears among the Ben 10: Alien Force credits, this is the first of four times it will appear spelled as one word, the first of three times it will be spelled as "Jetray."
Kevin breaks into Mike's mansion when Trina comes along. Kevin picks open the front door and argues with Ben while Trina slips inside, but nothing more comes of it -- Ben and Kevin don't enter, and nothing comes from Trina going inside.