Is it possible that the REAL Groucho Marx was there in a cameo, among all the party goers dressed as several Marx brothers ???? If not, one of the guests was a dead ringer for Groucho in appearance AND voice!!!!! Please comment if you agree...Graham
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As the photo linked below makes clear, Groucho Marx was on the Way We Were set the day the "Marx Party" was filmed -
http://www.corbisimages.com/stock-photo/rights-managed/OUT19565002/bar bra-streisand-and-groucho-marx
But I've yet to come across confirmation that he actually appeared in the scene itself.