What is some evidence of Holden being mad in The Catcher in the Rye?In class, we are doing a debate on weather or not Holden is mad.

I think that this debate can be a fairly intense one.  In
my mind, the most evident reason why Holden can be considered not sane would be the
setting of the narrative.  Holden is narrating the story from a place where he requires
some level of regrouping:

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Holden, the narrator, is telling the story from
a place in California, near Hollywood. Because he is run down physically, and is
probably mentally exhausted as well, it appears that he is in a sanitarium to recover
and regain his
strength.

Adding to this
would be the fact that at the end of the narrative, Holden "still does not understand
all that has happened to him" would also add to the fact that he is a bit unstable. 
Finally, the fact that Holden demonstrates an inability to fully function in the world
around him might help to prove while he can be considered someone in need of some level
of professional help.  Yet, all of these can be argued that these would be reasons why
Holden is more "normal" than the rest of the world.  While he cannot function in the
world, this might be due to the fact that the world is out of balance, and not Holden. 
The people that Holden interacts with for the most part are not authentic and
duplicitous.  While we might dismiss this as "the way things are," I think that there is
an argument to be made that Holden seeks to appropriate the world as it should be and
not for what it is.  This is a testament to Holden's high sense of moral standards, and
not insanity.