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In page Frankenstein (1931 film):

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As with many pre-Code films that were reissued after strict enforcement of the Production Code in 1934, Universal made cuts from the original camera negative,[3] and thus most of the excised footage is often lost. However, the scene of the girl being thrown into the lake was rediscovered during the early 1980s in the collection of the British National Film Archive,[citation needed] and it has been restored to modern prints of the film.[4]