- As of 2017, he appeared in three films that were nominated for the Best Picture Oscar: The Godfather (1972), The Godfather Part II (1974) and GoodFellas (1990). Of those, The Godfather (1972) and The Godfather Part II (1974) are winners in the category.
- Speaks fluent Italian and Spanish.
- The character "Louie" (voiced by Dan Castellaneta), a mafioso and second in command to Springfield mob boss "Fat Tony", from The Simpsons (1989) is based largely on Sivero, especially as he appeared in GoodFellas (1990).
- One of the few actors to play two different roles in The Godfather trilogy. Sivero appeared as an uncredited street extra in The Godfather (1972) and as Genco in The Godfather Part II (1974).
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