I don't think anything was classed "uninteruptable". I can remember fighting the white wurms in West ToV, they would both Complete Heal and Gate. Everything was pulled to the zone out so you had to stop their Gates or you were in for a very long CR.
I *think the units that an NPC could be moved by "pushing" it was directly related to their size. A large NPC will cover a lot more units moving from location to location than a smaller NPC. For instance if you have an NPC that is 1.0 size each hit could have gave a push of .01 units (100 hits to move it 1 unit). If you have another NPC that is 5.0 size each hit could have gave a push of .005 units (500 hits to move 1 unit). I think this is the most plausible, it would give the impression that many large NPC's were "interruptable".
Perhaps the rate of push for an NPC/PC was specifically related to their size. For instance say a typical player (1.0 size) has 1 unit of movement leniency to be interrupted. An NPC (Golem/Dragon/etc) that was 5.0 size could have had 5 units of movement leniency to interrupt.
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