I'm really surprised that most beamer slides I've ever seen have Figure/Table captions like this:
Figure: blabla blabla
Table: blabla blabla
which should have been Figure 1 or Table 2.
Why are the caption numbers missing? This is because beamer does not produce these numbers by default. To enable numbered captions, you have to put this in the preamble of your LaTeX document:
I'm a picky LaTeX users... I cannot stand captions without numbers.