While Amenadiel and his mom are visiting Uriel's grave, a grieving Lucifer is playing piano in his club. The song he plays is "The Unforgiven" by Metallica, possibly a reference to his guilt over killing his brother.
Stroopwafel, oliebollen and chocolade hagelslag are real dutch food names.
The name of the zombie groom is Edgar Romero. This is a nod to the godfather of the zombie genre of movies, George A. Romero. Edgar could be a nod to Edgar Wright who co-wrote and directed Shaun of the Dead (2004).
The bride's ex-boyfriend is named Jason Myers, likely nods to Jason, the killer in the Friday the 13th franchise, and Mike Myers, the killer in the Halloween franchise.
From certain angles Maze's hair-do looks like devil's horns.