Some suspense of disbelief is necessary, but...
Obviously in a Christmas movie about a woman who's dating Santa Claus's son, some suspense of disbelief is necessary. However there's always one thing that's just completely unreasonable and just kills the movie. Here, it was in the very beginning, when Peter proposes to Alex, one of her first responses is "I'll have to change all my legal identification to your last name!"
What scientist in her right mind would change her name just as her career was getting off the ground, especially with all the hype in the beginning with the gamma ray discovery?! What is the obsession with women changing their last name no matter what in movies like these?