The Italian headline of the newspaper article on Dick and Ingrid's escape translates as "Police Search for 2 Young Germans", but Dick has already been identified by the police as British in a previous scene.
At one point, Dick and Ingrid are half-way through painting their sports car black. Later, the car, hasn't got any black paint on it.
When Ornella Mutti is taking a shower, you can see in one quick shot that she is wearing panties.