Gina and Colette are both seen wearing orange HEV Suits rather than their unique colors in the final (white for Gina and maroon for Colette). This appears to have been a rather late change, as dialogue of a Security Guard still has him referring to their suits as orange.
There are several glimpses of levels that would later be cut from Decay. Clips of Dr. Keller and a security guard traveling through a large tunnel and a compact series of rooms full of file cabinets are likely remnants of Central Transit Hub and Hangar.
The trailer advertises 4-player deathmatch, presumably through the use of the PlayStation 2's multitap. The final game is not compatible with the multitap, limiting the player count to 2.
HECU render. Originally, they were supposed to have 3D rendered eyes, similar to the other human characters.Gina and Colette fighting Alien Controllers in the Resonance chapter, showing an earlier version of ht04dampen with different textures and catwalk cable placement.Gina and Colette in front of a mirrored screenshot of the ba_canal2 level, from Blue Shift's Duty Calls chapter.Gina next to the aforementioned level's Gargantua.Screenshot of the cut Hangar level.Gina and Colette swimming in Black Mesa's swimming pool.Gina and Colette fight an Osprey and soldiers.Gina and Colette fight an Osprey.Gina and Colette inside the hangar.Gina and Colette fight an Apache in a garbage dump.Gina and Colette firing at an Apache from behind a dumpster.Alternate scan of Osprey fight.Alternate scan of garbage dump fight.Another alternate scan of garbage dump fight.Crane, with Gina or Colette at the controls.Co-op screenshot of some Hangar location.