- Reportedly shares the same birthday (May 5) as both of his children.
- Vaughn Armstrong has now played the most characters (eleven) on "Star Trek". Jeffrey Combs, J.G. Hertzler, Randy Oglesby and Thomas Kopache have all played seven characters, putting Alaimo in third place with six.
- Along with Rosalind Chao, Jeffrey Combs, John de Lancie, Jonathan Frakes and Tim Russ, he is one of only six actors to appear in ten different seasons of "Star Trek": Star Trek: The Next Generation (1987) Seasons One, Four and Five and Star Trek: Deep Space Nine (1993) Seasons One through Seven.
- As of October 2001, his record for most "Star Trek" characters played has been tied by Jeffrey Combs.
- Has played more distinct roles than anyone else on "Star Trek": two different humans, two different Cardassians, an Antican and a Romulan. Nicknamed "The Neck" by his fellow actors on Star Trek: Deep Space Nine (1993).
- (May 1-3, 2009) Attended FedCon 18 in Bonn, Germany with his fellow Star Trek: Deep Space Nine (1993) cast members Nana Visitor (Kira Nerys) and Jeffrey Combs (Brunt/Weyoun).
- In December 2022, he announced that he would no longer be able to honor requests for autographs due to his age.
- Father of Michael Alaimo.
- He is a lifelong Democrat.
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