In the film, when Francois and Philippe visit Andre's laboratory from the previous film L'esperimento del dottor K., the messages Andre wrote to Helene on the blackboard can still be seen on it. But at the end of that same film, Helene had told Inspector Charas that she had erased them all off of the blackboard in order to cover up all traces of Andre's experiment.

Film

La vendetta del dottor K. (1959)

Persone

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