At the beginning of the film Phoenix arrives in San Francisco aboard Greyhound Scenicruiser 3107. Also seen are San Francisco streetcar 3 and an unidentified red Bristol Lodekka/Eastern Coachworks serving as a 'Visitor Information Center'.
I can't prove it, but this may be former Southern National BDV246C, which was seen in Indiana in 2000 in an almost identical livery.