Reused props: the newspaper Sir Andrew reads was read by Emma in A Funny Thing Happened on the Way to the Station (1967). The stone lions appeared once before in The House That Jack Built (1966). And the big "Thursday the 12th" desk calendar also appears in Mission... Highly Improbable (1967)".
The Jaguar E-type Coupé was Brian Clemens' personal car and was not damaged in the 'crash' - that was all paint and paper.