I’ve been on two Southwest flights recently where the plane type was incorrectly noted as B733.
http://flightaware.com/live/flight/SWA468/history/20110707/1900Z/KLAX/KBNA
SWA468 on 7-7-2011 with tail number N792SW
http://flightaware.com/live/flight/SWA744/history/20110716/2205Z/KBNA/KPHX
SWA744 on 7-16-2011 with tail number N472WN
Both are 737-700’s. Not a big deal but thought you’d like to know about it.