Continuity mistake: When Wilson MacLeish is kneeling on the golf course, the light changes drastically between close-ups (shadows) and wider angles (strong sunlight on the chest). (00:45:10)
Revealing mistake: During the gun prank, you can see in the revolver's cylinder the bullets - except when it squirts, the bullets are gone. (00:47:00)
Continuity mistake: In the finale, the wet stain on Mr. MacLeish's body changes between the close-up and the wider angle. (00:47:15)