The necklace and bracelet that Candace Cameron Bure wears throughout the movie actually belong to her 90-year-old grandmother; they were purchased by her grandfather in the 1940s.
One of the police officers says, "I've never heard of a Hudson", standing next to another officer played by Oliver Hudson.
Comets don't suddenly appear. They are generally visible for months, slowly getting brighter and getting a longer, more visible tail as they near the sun. What was displayed in the movie was more of a shooting star(meteor) in appearance.
A little under a year after the film premiered, on October 17th 2017, it received a novelization by Leigh Duncan, released as the first e-book from the recently launched Hallmark Publishing.
Malmedy where the husband was in the war is in Belgium, not in France like she says.