Widescreen Cropping

Caillou Gets Grounded
On Vyond Network, older episodes are widescreen cropped, however, VyondToons, VyondPreviousCentury, Vyond+, and Vyond Pluto TV are not cropped

The Simpsons
The episodes are widescreen cropped on most modern TV airings.

SpongeBob SquarePants
When the "Golden Age Set" (seasons 1-3) were released on Blu-ray, the show was cropped into widescreen, with some exceptions, like the TV scenes, the title cards (which were stretched out) and SB-129's opening credits (also strechecd out).