 According to one of the featurettes on the DVD, several of the shots  in the movie were added after initial filming ended. These included  the scenes of Rudy and Tripper at the bus station and of them  playing blackjack for peanuts. During the time off,  Chris Makepeace (qv) had entered puberty and had the beginnings of  a mustache. Bill Murray (I) (qv) decided that it had to go so he  took Makepeace over to a sink, lathered him up with soap and shaved  off his mustache. So Chris received his first shave from Bill  Murray.