AbdulAlhazred
Legend
Reacting to intruders is certainly a big difference compared to what other posters have laid out. I named several modules including Ravenloft, Dark Tower, Caverns of Thracia, ToEE, and Against the Giants that suppose that inhabitants of the dungeons may have different motivations, may ally with the party against other factions, may hunt the party down rather than stay in their coded area, strategize against the party. Thats certainly ground for the DM to apply their creativity rather than random rolls dictated by the 1e sourcebooks.
I've run G1,2,3 many times, they're extremely sparse on anything but room description. There are a few places where it's noted that noises of battle or fleeing monsters could bring another group of monsters from a nearby place. I recall nothing at all which discussed alliances with giants and such.
ToEE is equally unsophisticated, there's a bit more discussion of monsters reacting, and I think there are a couple of places where you can gain an ally if you do specific things. But it has been, probably 40 years since I cracked open a copy.
The other one I am familiar with is Ravenloft and yes, it spells out some things the PCs can do. The problem with it is that the game really has no support for what it's trying to do. It is exactly illustrating what @pemerton pointed out.