When Chucky is tied up, he wears the same faceguard Hannibal Lecter wears in The Silence of the Lambs to prevent him from biting anyone. Additionally, when he goes to talk with Glenda he says the world "Closer!" in the same inflection Sir Anthony Hopkins did in the film, during the scene where Hannibal asks to see Clarice Starling's FBI badge.
The entire episode is rife with references to the 1973 film The Exorcist, including, but not limited to: Chucky rising from the marble platform, the lines, "the power of Christ compels you" and "Your mother sucks cocks in hell", the hand-motions during the spraying of holy water, and Chucky vomiting all over Father Bryce.
The letters of the opening title are made up of lots of lit candles.
Andy says his babysitter was killed 34 years ago by Chucky. Technically, that is right. However, season 1 took place right after Cult of Chucky (2017) and this is set 1 year later, which means it should be around 2018 which would be 30 years ago, not 34