Conversation so far:
Where does Andy Bernard pick up from season 4?
Between season four and five, Andy Bernard plans his wedding with Angela Martin, although his ideas are often rejected by her.
Does Andy Bernard have any rivalries with Dwight Schrute?
Unbeknownst to Andy Bernard are the continual affairs between his fiancée Angela Martin and Dwight Schrute.
Does Andy Bernard get revenge on Dwight Schrute for continual affairs with Angela Martin?
Dwight Schrute realizes that Angela Martin has had sex with Andy Bernard as well, despite telling Dwight that she had only been sleeping with him.

Question: Are there any other rivalries going on?
Self-contained rewrite: Are there any other rivalries going on besides Andy Bernard and Dwight Schrute?