Small parasitic seed pods begin appearing in San Francisco. Health Department workers, Matthew Bennell (Sutherland) and Elizabeth Driscoll (Adams), both notice that friends are complaining about close relatives being somehow different. When questioned later, these people also seem changed and now deny everything they previously said or make lame excuses. As the invaders take over more human bodies, they become more obvious. Bennell and Driscoll, who have by now witnessed attempted "replacements," realise that they and their friends, Jack and Nancy, must escape or suffer the same fate. However, none know who to trust for help or who has already been snatched.
Answer: On the DVD commentary, Director Phillip Kaufman explained that the leather on Nimoy's hand was the actor's idea and simply showed how kooky the character was. Fits the character well really.
Gavin Jackson