Mitchell never mentioned any UFO incident on Apollo 14, although those "blue light" pictures have been publicly known for quite a while.
I find that very interesting too, but have no more information about it than what I already posted.
The "blue lights" on the Apollo 14 images aren't real objects. They're blemishes on the film. I believe they're static electricity discharge marks. They occur quite frequently on magazine 66 and they're always oriented in the direction of film travel through the camera. Here's a frame where the marks appear on top of the lunar module:
And a here's a closeup crop from the high resolution version: