I think the most noticeable/annoying thing in my school's theatre is the way to get to edge of the grid. A couple of years ago, we got a brand new lighting board, as a compensation prize for not being included in the new arts building. Because whatever the lights were hanging from at the time was SO unsafe, as pointed out by the guy installing the new board, we got a very nice pipe grid, which goes significantly past the stage, so we can actually light said stage effectively.
However, the edge can't be reached by ladder, because it is over the audience. The seats are retractable (it's weird), but they have to be out a lot of the time because the school uses the theatre for class meetings and things. So, in order to get the Genie (a cherry picker type device) to where it needs to be so someone can hang/focus lights, everything needs to be moved out of the "orchestra" and onto the first levels of the audience, including the light board and monitor and any stair units leading up to the stage.
Our current show has a stair unit down stage center, so we had to unscrew it, carry it all the way to the wings, get the Genie in there, fix lights, pull the Genie out, and put the stair unit back. Really, really annoying.