Visible crew/equipment: Towards the end, right after they watch the house blow up, you can see a hand holding a black object popping up from the right side of the screen. This happens right before Malcolm says, "Pretty sure".
Visible crew/equipment: When Lois gets in the car after she gets offended by the fact that everyone in the family forgot her birthday, you can see a cameraman with the camera reflected on the rear window when she leaves. (00:10:15)
Other mistake: At the beginning of the episode when they are driving in the car, the door is opened to make room for the camera outside but the opening is visible in shot. (01:49:00)
Answer: It is made up - although it is implied she is Croatian, she never mentions it herself.