#which is probably why i noticed now on like my dozenth pnf rewatch

[cytochromec]

I never noticed before now, but in the 2012 Phineas and Ferb episode "Buford Confidential", when Buford and Brigitte are in the art museum in France the paintings are (mostly) background art from Phineas and Ferb.

Circled in orange are background paintings by Jill Daniels for the episode Doof Dynasty, for which she would later that same year win a Primetime Emmy award. The picture circled in purple may have also been from Doof Dynasty, but I think it might instead have come from Lotsa Latkes.

Circled in yellow is flower world art by Jill Daniels featured as (I think) the first dimension that they travel clockwise through while fleeing the Normbots in Across the Second Dimension.

Above Buford and Brigitte's heads is a painting of a chair. I don't recognize this chair specifically, but in the Gallery Exhibitions section of Jill Daniels website ("Stories From The Unseen - Using objects from the home as a framework for revealing human emotional connection"), she has a lot of paintings of chairs. None of them seem to be an exact match (though there's one that's pretty close), and I don't otherwise recognize this chair from an episode. Presumably it was included as a joke in reference to this exhibition, likely by Daniels herself.