There is an angel-winged Lucifer Funko Pop doll on Dan's desk, possibly a present from Lucifer in return for the amethyst bracelet. Funko does not have a Lucifer line, but several fans have gifted custom-made ones to the actors at conventions, and there are independent artists who make and sell kitbashed versions. This is likely one of them.
Small moment where Sister Angelica appears to recognize Lucifer, starts to point to him, reconsiders, and continues walking with a puzzled expression.
There is a possible Easter egg in the "Help The Helpless" sign. "We help the helpless" was the motto for Angel Investigations in Angel (1999).
Angels reflect/exhume different feelings from humans. Lucifer clearly brings out desire. Michael, fear. Here, Amenadiel learns he affects people with strong faith; explaining why Ella's acted weird when they met.
Lucifer gives Chloe a box of matches to burn his gift on the beach. In Dutch, "lucifer" means "match."