The shoe of the person who steps from the wardrobe is first a casual black loafer, but in the review of the scene in the explanation, the shoe is a formal patent leather that would have been worn in a wedding of the time.
Timeline on Cully's wedding day makes no sense, as too many sequential events are shown to have unfolded while the bride was awaiting her father's arrival for the ceremony to begin.
Although Barnaby is correct in saying that there are no snakes in New Zealand, he is quite wrong about there being no spiders: there are numerous spider species found across the whole country, both native and introduced.
When Simon enters Cully's bedroom and asks why she's up there, Cully makes mention of "childhood memories." Cully was already in her 20s when the Barnabys moved into a new home in Blue Herrings (2000), which is different than the home shown here, so she would not have childhood memories of her bedroom in this house. However, that does not stop her from having childhood memories connected to belongings she had as a child that did move, or events going on in her life (like her dad putting work before his personal life) that could spark some memories.
Marina the bridesmaid, being murdered as seen through the window is wearing a long sleeve waist length white jacket and floral skirt however Marina, the bridesmaid, was wearing a beige wedding dress with short cap sleeve bolero.
After interviewing Mary, Jones walks off and hears the sound of her snapping the rabbit's neck. However, he reacts too early by turning around before the sound is heard.