Some more screen caps
You can see all 3 cameras in this shot, though the Pentax is slung over his shoulder and partially obscured
You can almost make out "Asahi PENTAX". The self-timer under the rewind knob would seem to identify this as a SV (H3v).
Anyone want to guess what lens and f-stop?
You can clearly make out "Nikon" here.
My impression is that the Pentax gets less screen time than either of the Nikons individually. It might seem unusual to have competing products on screen but as I recall this was still an era without complicated legal maneuvering have products on-screen. Indeed the product makers would often write the studios a check as a thank-you for the free advertising.