Molly's parents are played by Alice Eve's real-life parents, Trevor Eve and Sharon Maughan. Alice and her father also both appeared in Bees Make Honey (2017).
One of the difficulties of shooting at a real airport was that the 400 extras all had to clear security - so they weren't allowed liquids or sharp objects.
Jay Baruchel said that he was not willing to do nudity, so the scenes where he is "manscaping", the butt we see is actually that of a body double.
While Kirk is astonished that Molly speaks French when they went on a date at the restaurant, Jay Baruchel (who plays Kirk) actually speaks French fluently.