The closest thing to a microscopy documentary I can recall is the
Saturday Night Live segment of "Leonard Pinth-Garnell's Bad Musicals"
which featured a musical based on the life of Leewenhoek. This sketch
originally aired on December 10, 1977. A synopsis can be found here:
http://snlarc.jt.org/detail.php?i=1977121010
The musical, as I recall, was proclaimed by Pinth-Garnell to be "simply
terrible."