When Dennis opens the refrigerator in the office of the pet cemetery, two dead dogs can clearly be seen on the top and bottom shelves. Dennis leaves the refrigerator door open while he turns and sets a drink down. When he turns back, the refrigerator interior shows something covered in paper on the top shelf and a dead cat curled up on the bottom shelf.
There is a rose resting on several books adjacent to the poetry book Dennis takes from the shelf. When he returns from the refrigerator and puts the milk carton on the books, the rose is gone and the books have been rearranged.
Mr. Joyboy's glasses change from when he is arranging Hinsley's face to when he goes to see Aimee - they go from metal frame-less to dark plastic frames.
Early in the movie, Mr. Joyboy refers to shopping at the market on La Brea Street. It should be La Brea Avenue, but most Angelinos would simply say "La Brea."
While the Blessed Reverend delivers his upsetting monologue to Aimee, the naked "statues" behind him can be seen moving (before the big orgy scene).
Henry's voice says "Will", whereas his mouth appears to say "Jack".