Just thought I'd mention that a couple of times after the push has completed on a brand new aircraft (this recently ocurred with a couple of Ryanair 738's) I think the cover that moves down to cover the hole where the bypass pin is inserted doesn't move to it's normal position because the paint is thick and new.
This will obviously wear away after time but I guess it may be worth checking that after the pin is removed, all is as it should be... I don't work on the ramp, these were details I sort of pieced together and (shock horror) assumed.