The supplied article text contains only the headline and website navigation, with no substantive article content to summarise. It therefore cannot establish which 1970s film Robert De Niro was referring to, the circumstances in which he missed the role, or why he described it as “the best job I never got”.

The headline indicates that the article concerns a celebrated 1970s film and an unrealised opportunity involving De Niro. However, no supporting details, dates, names, quotations beyond the headline, or contextual information are included in the provided text.