Continuity mistake: When Annabelle gives Frederick her gun, he places it in the mini-coffin and closes the coffin. However, in one of the next shots, we see that all coffins are open.
Super Grover
31st Mar 2006
House on Haunted Hill (1959)
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Suggested correction: It's not "in one of the next shots" it's actually many shots later, so anyone could have touched that mini coffin for any reason during the time off-screen. After Frederick closes the top of the mini coffin, it cuts to the scene upstairs with Nora and the missing severed head. Then a considerable period of time has passed until we see the mini coffins again, when Lance walks into that room and sees Pritchard with the knife.