1. For gameplay reasons. Storywise, maybe because they don't see things above their heads? Who knows? Why can't they leap across gaps or enter doors?
2. Again, for gameplay reasons. Probably they feel them.
3. And again, for gameplay reasons. Maybe the same inner sadness that makes him blue makes immune to laughing gas?
4. Laughing Mudokons don't, and angry Mudokons are working already when Abe comes along. They're probably glad to forget the interruption and go back to their work.
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