I was on a KLM flight ex-LHR fairly recently when the pilots only realised the nose-gear pin hadn't been removed by the ground crew when they tried to taxi away from the position they had just been pushed back to and realised they had no steering...
I seem to recall the flight was delayed a bit so this is perhaps an example of what can get forgotten when under pressure to meet a slot time...As the groundcrew's headset had been detached, I'm guessing some frantic waving was involved!!
Is this item on a checklist at all (737NG in this instance), or is it just procedure that the ground crew present the removed pin to the flight crew?