\makeatletter
\@ifclassloaded{article}%
  {\renewcommand{\note}[2][1]{\textcolor{blue}{\textit{#2}}}}%
  {}%
\makeatother

\AtBeginSection[]
{
  \begin{frame}
    \frametitle{Inhaltsverzeichnis}
    \tableofcontents[currentsection]
  \end{frame}
}