I have picked two episodes to review that come from early in the second season, In "Don't Even Blink" it starts with Stacy suggesting that Candace should find out where Phineas and Ferb's inventions go, which leads to them asking the boys to build a big obvious ride and Candace and Stacy can keep watch on the invention. Candace at first does not let the boys and their friends ride on the big obvious ride but Candace realizes that mom comes home after the boys are finished with the invention after which it disappears. After the boys and their friends finish playing on the invention they go back to watching the invention.