Mark Elias, who plays the groom in the beginning, would go on to play EMT Tim Rosewater in this show's spinoff, "9-1-1: Lone Star."
Buck says to his sister that Abby went away to have an "Eat Pray Love" experience. The Eat Pray Love film adaptation was directed and co-written by 9-1-1 co-creator Ryan Murphy.
The voice heard as Maddie Kendall's ex-husband, Doug Kendall, is portrayed by Brian Hallisay, who has been Jennifer Love Hewitt's actual husband since 2013.
The head-cemented-into-a-microwave story is based on actual event that occurred in the UK in 2017. It is not made clear if the characters were 'inspired' by this or not.
Oliver Stark says that the mark on his left eye is a birth mark. It is in fact, in real life, his birthmark.