Visible crew/equipment: In the first scene, the shadow of the mic can be seen on Mr. Wheeler's Santa Claus outfit.
Visible crew/equipment: Crew members can be seen in the background and behind the trees when Frank is on the roof of the runaway mini when it is on the pavement and knocks the walking stick out of the man's hand.
Continuity mistake: Several times when Frank is having his driving lesson in the white Mini, the shots from inside the car don't match the shots from outside the car.
Revealing mistake: When the flying saucer crashes down onto the wishing well, it is obvious that the Father Christmas in the saucer is a dummy.
Continuity mistake: Mr. Finney is explaining the mirror signal manouver procedure to Frank during his driving lesson in the white Mini. While they are parked, the shots from inside the car show a line of parked cars behind the white Mini. But when Frank moves off, the shots from outside the car show no cars parked behind the Mini.
