If that smarmy game show host Kevin's parents keep watching looks (and sounds) familiar, that's because it's Jim Broadbent, an Oscar-winning actor whose film career was just getting started when he showed up in this film. You probably know him as Professor Slughorn in the Harry Potter films or as Nicole Kidman's pimp Harry Zidler in Moulin Rouge! (Source)

The case of David Rappaport, who plays the self-important leader of the dwarves, Randall, is a very sad one. It's all the sadder because Rappaport made some huge strides forward when it came to little people acting and performing in movies. He never considered himself a "little" actor—just an actor who happened to be small—and that fight made his bouts with depression worse. Despite a career that included movies like Sword of the Valiant, The Bride, and a TV show called The Wizard, his depression ultimately consumed him, and he committed suicide at the age of 38. Nevertheless, his work made it possible for other small actors to find more fulfilling work. (Source)