The only film in the trilogy to actually reference the titular Fear Street (Fier Street).
Goode was also the surname of a prevalent family during the Salem Witch Trials.
Every state in the nation has a code for someone who is considered mentally unstable. While the official code differs from state to state, California's "5150" code is used as slang in every state, and uniformly understood.
Blink and you miss it: at 11:53 minutes, while Sarah is turning pages of the book, a glimpse of the Sephiroth (Sefirot) is shown. Sefirot is part of the Kabbalah in Jewish mysticism. And at 12:02 there's a drawing of a figure resembling Baphomet.