Solr4 - new characters requiring backslash escape?

[Shawn Heisey]

I've been putting a new Solr 4.1 deployment through extensive testing 
before we upgrade from 3.5.

My testing has turned up two characters that used to work fine with no 
escaping that now give syntax errors without a preceding backslash.  
Those characters are forward slash and apostrophe (single quote).

Is there a canonical list of characters that require backslashes to work 
properly?  I know about some already, such as parens and brackets.

On the same subject, but far less important because with SolrJ I don't 
think I have to worry about it, is there a list of characters that 
require URL encoding (%XX)?

Thanks,
Shawn