Boarding the wrong plane
On Thursday LAX-EWR, one family and one woman got on the plane when they were actually going to Houston. The woman was stopped by the flight attendent right as she got to the plane, but the family got all the way on and put their luggage up. It caused quiet a commotion on board when they had to get back out as the plane was still boarding and the aisles were full. All in all, it was handled pretty well by the flight attendents and we got out on time.
I noticed that at the gate, when the crew called the elites, they told us to line up on general access side of the ropes, and started letting people in. Of course, then other elites started coming up the blue carpet. Then one of the agents started going up the line checking boarding passes to tell the non-elites to wait and she was tearing off the corners that have "Elite Access" printed on them. So when I got to the door, the agent just looked at that corner and said, "oh, she got you already".
If that was a new procedure, it wasn't working!