About 31 minutes in, when the helicopter first swoops over Mannix's car it is a Bell 47G (the open frame tail boom can be seen) then it is a Bell 47J-2 (N73202, s/n 1850). The 47J has an enclosed tail boom. Several other shots alternate between the two in this sequence.
The first picture from the microdot is simply a schematic diagram of an ordinary radio receiver.