In "From the Terrace," Paul Newman handles a slide rule while he's
visiting his old aircraft company. He's not calculating anything, just
fiddling with it during a meeting. (Not as exciting as "Mantis",
however.)

There's also a movie with John Wayne, I can't remember the title,
where a railroad is being built somewhere in the American West,
and Wayne scornfully tells the boss: "You don't build a railroad
with sliderules!" (What else would you expect from John Wayne?)