Agriculture and Fisheries are not covered by the EEA. In particular control over fisheries is a big deal for countries like Norway and Iceland, and perhaps one of the main reasons Norway is reluctant to fully join the EU. From the Wikipedia article:
Agriculture and fisheries are not covered by the EEA. Not being bound by the Common Fisheries Policy is perceived as very important by Norway and Iceland, and a major reason not to join the EU. The Common Fisheries Policy would mean giving away fishing quotas in their waters.
Additionally, some of the financial obligations do not apply:
The EEA countries that are not part of the EU do not bear the financial burdens associated with EU membership, although they contribute to the EEA Grants scheme to “reduce social and economic disparities in the EEA”, and some choose to take part in EU programmes such as Trans-European Networks and the European Regional Development Fund