I watched Lonely Among Us the other day and noticed another "P" appear just before it appeared on Geordi's console. It was very brief and on one of the science stations. I also thought the effects of the The Last Outpost were done very well, especially when the guardian appears.
Yea, it was less noticeable in the SD version... I was showing my dad the difference in quality between SD and HD for 11001001... and when the Enterprise is pulling past the camera through the doors, during the interior shot at the beginning... he's like "Look! You can see right through the bussards!" when referring to the original SD transfer.