Continuity mistake: When Abberline draws the knife on the board its lines are jagged. When it cuts to different angles of the board the knife is completely different, smooth lines and it seems much larger and it is perfectly aligned on the board.

From Hell (2001)
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Directed by: Albert Hughes, Allen Hughes
Starring: Johnny Depp, Ian Holm, Heather Graham, Robbie Coltrane
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Jack the Ripper: I shall tell you where we are. We're in the darkest region of the human brain, a radiant abyss where men go to find themselves.
Netley: I don't understand, sir.
Jack the Ripper: Hell, Netley. We are in hell.
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Answer: His eyes are not just darker, his entire eyes are completely black. This was done by CGI effects to show that the murderous Ripper side to Gull's persona is taking over and is in control.
Twotall