The late Robin Williams appears with his ‘Jack’ co-star, Adam Zolotin, in previously unreleased footage behind the scenes of the movie, which is celebrating its 30th anniversary in August. In the clip, Robin and Adam improvise a song during the rehearsal of a scene that includes Fran Drescher. In the heartfelt comedy, Robin plays a 10-year-old boy trapped in a 40-year-old’s body. Jennifer Lopez plays Jack’s 5th grade teacher. It was one of her first-ever big screen roles.
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