Love Makes You Dumb: Lotso is so mad over being replaced, he turns his back on bonding with kids. And in hypno's defence, it's the way you asked for a source that was a problem. Chunk's line about Buzz not being "the sharpest knife in the place where they keep the knives", upon which Sparks points out to Chunk that he is neither. People might be forgetting that there's been a few President Barbie dolls over the years, so she'd know political science topics. Then a pink sports car turns up, then spaceman Buzz Lightyear and later Slinky Dog is some sort of high-tech forcefield dog contraption. Even if they watch Scooby Doo and notice Fred's famous ascot, it's not often referenced or named in the show.
Then a Rack Focus reveals a patch of scum on the mirror just big enough to obscure him, as the janitor reaches up to wipe it off.
During his discussion with Woody, Chatter Telephone boasts that "they'll never break [him]". When they return, they save the day and things get much lighter and fluffier. The toy might have once been beloved but kids aren't as apt to play with them today. Taken Up to Eleven when Hamm is playing Lotso's Theme while he's in jail with the others, when Buzz loudly tells him to be quiet. Woody breaks out of the daycare center through a bathroom window.