This episode revolves around Hands Across America, which took place on May 25, 1986, but when discussing the playlist for the school dance, Madonna's "Like A Prayer" was mentioned, which was not released until 1989.
When Coach Mellor announces that he's the Regional Coordinator, one of the kids in the stands is wearing a Rush "Hold Your Fire" t-shirt. As mentioned above, the date of the event was May 25, 1986. The album came out on September 08, 1987 and Neil Peart, the principal lyricist of the band, didn't even start writing for the album until the previous September, 4 months after the HAA event.