Revealing: The wires holding the cake knife are visible as it's cutting a slice.

Revealing: In addition to Samantha, Elizabeth Montgomery also played Serena. In scenes where both characters appeared, Elizabeth would face the camera and play one character and another actress, Melody McCord, would play the other with her back to the camera. But in this scene, Melody (portraying Samantha), with her back to the camera, inadvertently turns her head, revealing her face.