Father Brown, Lady Felicia and Mrs McCarthy travel together to Leonard Quinton's poetry recital in a Rolls Royce. During the journey the camera pulls away to show the car traveling up the road where it is clearly visible that the car no longer has any passengers.
When Lady Felicia sprains her ankle, she says she broke the heel off her shoe. But later when we see her hobble along with the help of the others, it is clear that both shoes have their high heels attached.
When everyone is leaving at the end, Fr. Brown remembers his umbrella, but forgets his hat.