Looking at the "Inflight Amenities" pages, I frequent see some mind-boggling math on the aircraft capacities. Here's an example from CO494 on 4/15, which is on a 753:

Aircraft

* Boeing 757-300
* Capacity: 175 (24 First Class, 192 Economy Class)

I believe 24/192 is correct, but they don't add up to 175! I've found similar mathematical errors for the 735 and 752, but I haven't looked at every aircraft type.