I think what they were saying is that they stopped doing all that stuff after the 2 year mark. It's been 5 years since they've done awesome stuff like that.
Painted a Continent- Well, they painted a desert. I personally think that's close enough.
Discovered Something That Doesn't Exist - I'm pretty sure they made that reference in the nanobots episode
Give a Monkey a Shower- They literally did that. And crossed it off a list, I think. And had the music from the theme song play in the background.
Finding Frakenstein's brain - They almost did that. In the episode with the balloon race to the top of the mountain. Buford's balloon popped or something so Phineas and Ferb rescued them. There was something about a swordfish, I think, and Ferb crossed that off a list, and Phineas said how now all they needed to do was find Frakenstein's brain, and Buford replied that that was in his balloon.
the episode with the giant platypus
Discovered Something That Doesn't Exist - I'm pretty sure they made that reference in the nanobots episode
Give a Monkey a Shower- They literally did that. And crossed it off a list, I think. And had the music from the theme song play in the background.
Finding Frakenstein's brain - They almost did that. In the episode with the balloon race to the top of the mountain. Buford's balloon popped or something so Phineas and Ferb rescued them. There was something about a swordfish, I think, and Ferb crossed that off a list, and Phineas said how now all they needed to do was find Frakenstein's brain, and Buford replied that that was in his balloon.