SENECA FALLS, N.Y. - Zuzu has a cold again. She sniffles and sucks on a cold pill as she signs autographs for fans lined up to the door in a coffee shop. Karolyn Grimes jokes that she left her coat open, like her character Zuzu Bailey in "It's a Wonderful Life." A more likely culprit is the holiday crunch of appearances by the former child actress _ from a Victorian festival in Puyallup, Wash., to the Colorado Country Christmas Show and now to Seneca Falls, which claims to be the inspiration for director Frank Capra's mythical Bedford Falls. Around...