The Invisible Man ReturnsGoofs
Geoffrey Radcliffe had been invisible for several days through the course of the film. As such, it would have been impossible to see his reflection in a mirror and therefore he couldn't groom himself. Yet when he becomes visible in the final scene, he is perfectly clean-shaven and his hair impeccably combed.
Crew or equipment visible
Incorrectly regarded as goofs
In The Invisible Man (1933) the invisibility drug had to be taken repeatedly over several weeks to be effective. Here (and in the later film Invisible Agent (1942)) it works instantly after only one injection but it has been nine years since Jack Griffin's death and all the while his brother Frank has been working on trying to improve the formula.