Duke Nukem Wiki
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Like many of the levels on the N64 port Movie Set has been expanded and features a whole new area at the far end where the helicopter crashes. This new area leads to a small security building (which can't be entered), and a new movie set based on Area 51 (this can only be accessed once the player has pressed the switch to open the subway door).

There is a switch in this room which will reveal a hidden passage which leads to a secret exit to the real Area 51 Beware, this area is guarded by several Protector Drones.

The hidden level Tier Drops, which is the original secret level, was dropped from this port in favour of Area 51.