When Mrs. Bedeker and the doctor leave the bedroom, the bed visible through the doorway behind them is now empty.
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.