1) I think the biggest change was in the storytelling format. The show was never a procedural, exactly, but this season had absolutely no episodes that could have qualified as standalones at all (though there were plotlines that could have). The season began with a particular storyline and it was that storyline that also ended the season.
2) Philip and Elizabeth didn't always see eye to eye on everything, but they were definitely a clear team for the entire season. This meant that it often felt like it was "them against the world," including (sometimes) the world inside their own home.
3) The lack of a consistent handler throughout the season made for a really chaotic relationship between Philip and Elizabeth and their KGB superiors.
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2) Philip and Elizabeth didn't always see eye to eye on everything, but they were definitely a clear team for the entire season. This meant that it often felt like it was "them against the world," including (sometimes) the world inside their own home.
3) The lack of a consistent handler throughout the season made for a really chaotic relationship between Philip and Elizabeth and their KGB superiors.
-J