John Gulager:
If you look closely at the police arresting Arkin in the hospital, one of them is horror director John Gulager who has collaborated with Marcus Dunstan on other films.
(at around 14 mins) When Arkin breaks through the window to escape the Collector at the club he lands on a parked car. The windows of the car blow out before he makes contact with the roof.
(at around 14 mins) When Arkin escapes the party by jumping through a window he is barefoot and bloody. However, while falling from the window, landing on the car, and walking down the street he is wearing blue shoes. Soon after, at the hospital, he is bare foot again.
Arkin: All those insects, you're quite the collector. In a 200-mile radius from where we last saw each other, there are 14 licensed entomologists. And you were number 12. Your daddy ran a museum, didn't he? Fucked you up real good. Turn around.
Mr. Peters: Elena. I know this must seem like the darkest day of your life. I know you miss your mother. And even though she's not here right now, she'll always love you. You understand that, don't you, darling?