The police helicopter (N3072G, 1964 Bell 47J-2A s/n 3129 registered to Golden Gate Helicopters, Inc.) was seen circling Alcatraz before it was called for to transport Stone and Keller. It could be seen briefly after the sea gulls passed the water tower when Eddie (Tom Bosley) was out in the yard daydreaming.
In the payphone scene, when Eddie has finished the call and is leaving the booth, the hand of one of the camera crew holding some prop is reflected on a window and appears against the back of Eddie's head.