According to the Blu-ray's 'making of' featurette, Peter Cushing (Victor Frankenstein) is vigorously cutting away at a cabbage during the title sequence. It was originally used to emulate the crunching sound of slicing through bone, but this was eventually censored with the title music. Cushing, being very adamant on the technical details of his performance, always demanded the presence of technical advisors on set. During the surgical sequences, he wanted to make sure he used the scalpel correctly. He was also quoted to "want to convince any doctors in the audience."
In La maldición de Frankenstein (1957), Hammer were barred from copying any details from the Universal films of the 1930s and '40s, including the famous monster make-up. This film, however, was distributed by Universal, and so Hammer had free rein to copy elements from the Universal franchise, most noticeably the creature's make-up and the laboratory sets.
"The Evil of Frankenstein" was a box office disaster when released. A lot of the criticism was focused upon the poor dialogue and the miscasting of Kiwi Kingston as the creature.
Hammer stalwart Terence Fisher was originally slated to direct the film, but had to bow out after an automobile accident, leaving cameraman Freddie Francis at the helm.