Standing on chairs and stating oh captain my captain came from dead poets society released 22nd September 1989 yet the voiceover claims it's January 4th 1980 something so unless they watched a pirate version of the film they shouldn't have known about the scene.
The schoolyard has a palm tree in it. Palm trees cannot survive in cold-weather states like Pennsylvania.
This episode takes place during the 1980s, yet both Adam and Emmie are wearing jeans that wouldn't come into style until the late '90s. It would have been difficult, if not impossible, to find jeans that looked like theirs in the US in the '80s.
According to the opening voiceover, this episode takes place on "January 4, 1980-something" in eastern Pennsylvania. Despite the fact that it should be the middle of winter, the kids are pictured eating lunch outside without jackets, and all the shrubs and trees are green even though they should be brown.