In the individual 'file history' view, logical view mode, a revision is shown when a branch is created that includes that file. This is different than in the CVS mode, where branches are only included once a change is made on that branch. FishEye should offer an option (with a globally settable default) to hide these 'branch creation' revisions, both from listing as a revision and from appearing on the 'History' graph for that file. (I'd prefer not even having the option, and just always doing this... but I could see how some people might want it listed.)

Listing the branch creation revisions shows a ton of clutter on the individual file history pages and makes using them inconvenient. (It also makes the history graphs completely unusable for projects that branch a lot.)