Hello,
Looks like in both cases the exported description is identical:
#+begin_latex
\begin{description}
\item[{with\footnote{Huh?}}] the
footnotes\footnote{OK}?\footnotetext[1]{\label{org9240374}Huh?}
\end{description}
#end_latex
The issue seems to be that the article and beamer classes are
handling footnotes differently. Removing
\footnotetext[1]{\label{org9240374}Huh?} removes the duplicate
from the beamer export, but then the article export is missing the
appropriate footnote.
We should be able to patch the export code to ignore the extra
\footnotetext when exporting to beamer.
Cheers,
--
Adrian Bradd