You might think it odd that, for its penultimate summer production, the Timber Lake Playhouse is staging Irving Berlin's White Christmas, thereby celebrating the holiday season a good two or three months before the malls will. But the actual presentation turns out to be stranger still. Not only are you getting White Christmas here, you're getting three or four different White Christmases; the results aren't bad, necessarily, but the show winds up feeling a bit like the Bing Crosby classic as co-directed by Michael Curtiz, Tommy Tune, and Rip Taylor.