Differences between PowerPoint and Impress (ODP) files

In the Impress Guide, we warn people that there are some differences
between the file formats that mean not everything in one format will
convert and work in the other format.

I would like to reference a list of differences between the two, but the
only list I can find is one produced by Microsoft, and I would prefer
not to link to that.
http://office.microsoft.com/en-us/powerpoint-help/differences-between-the-opendocument-presentation-odp-format-and-the-powerpoint-pptx-format-HA010287723.aspx

Is such a list available for LibreOffice?

--Jean