Bugging Out is the 3rd episode of "The Adventures of Irving and Friends"
When Albert learns that Irving has a crush on Candace, he suggests that Irving try to impress her. So Irving decides to help Candace bust Phineas and Ferb. Meanwhile, Doofenshmirtz tries to get rid of all the bugs in the tri state area.
The "Too Young" Line
Albert: Do you like her? Or do you LIKE like her?
Irving: *Sigh* Yes. Yes I do.
I know what we're gonna do today.
Irving: Hey...is Isabella here yet?
Phineas: No. Why?
Irving: No reason. So... Whatcha doin'?
'Isabella's Voice: I Heard That!
Albert mentions his crush on Candace, and the time he tried to bust the boys (Doof Side of the Moon)
Irving mentions Baljeet calling him a nerd (Hide and Seek)
Doof mentions the Bread-Inator (Crack that Whip)
Haney appears again (The Magnificent Few)
The Nagging Wife and Husband appear again