I Sell the Dead (2008)
In conversation Father Duffy (played by Ron Perlman) at one time say "There are things that go bump in the night" (bump is replaced with a bump on the table) - this is also a central piece of dialog in Hellboy, which stars Ron Perlman
film's subjects were director/producers of I Sell The Dead
film's subject was art director for I Sell The Dead
A flashback in "I Sell the Dead" is taken directly from footage from "The Resurrection Apprentice".