In the final scene of the film, the vampire Eramus (Vincent Price) is telling his fellow monsters at the Monster Club about all the "wonderfully evil" things that the human race has done throughout its entire existence on Earth; however, during his speech, it is rather obvious that Price is distracted by something just off to the side of the camera. Though he is looking to his left, his eyes keep looking back to his far right to a specific spot as he speaks. Either he is reading some of his lines off of a nearby cue card or something just off-screen has seriously caught his attention. He repeatedly stares at it out of the corner of his eyes for several long moments.
In the segment of the film "The Humgoo" when Sam first pulls up at the village of Loughville, a crew member in a red checkered shirt and denims is clearly visible for one second in the driver's door rear-view mirror when the car door opens.