When Mr. Cadwallader first appears, Walter Bedeker looks to the screen's left and he is laying on the left side of the bed from the camera's point of view, with Cadwallder to the left of the bed. In the next shot, Walter is on the right side of the bed and Mr. Cadwallader is standing on the right side of the bed. However, the first shot was shown through a mirror, so this was not actually a continuity error.
When the protagonist proclaims, "...the new Walter Bedeker!," part of the footage is run in reverse.
Walter is tried for killing his wife, but, despite his confession, he didn't kill her; she fell off the rooftop of their apartment building, so he wasn't guilty.