The only conclusion one can draw is that these light patches were produced by light inside the cabin of the LM (either by internal lighting or the bright surface of the moon) and not through any defects on the film created before or after exposure.
Was it the same camera? Yes it was! What about a camera leak? And what is the dark “shape” down the right side of the video? Was the camera faulty in some way?
Astrophotographer. One only has to look at the
whole video (both of them) to note that the “patches” of light (especially noted) in the upper and lower right corners of the frame
do not change at all, no matter the camera angle (and it rotates through at least 90 degrees and back over the duration of the “UFO” video), no matter what the subject (including some
completely blank frames where either a lens cap was left on or something else occurred to render the frames completely black), or the focal length changes (including close-ups of the external scene where no LM window frame is visible to where the LM window frame actually fills ¾ of the image)… through ALL these transformations the “light patches” remain
precisely (exactly, specifically) the SAME throughout. You can conduct all the handwaving rationalisations you want, but this FACT will always remain.
Further, given all the camera variation mentioned above, if it were an internal light source, it would have
varied over the time of the “UFO” video (Magazine K). It does not. It is that simple Astrophotographer. NO internal light source affecting the video. They are all
artefacts Astrophotographer, nothing more, nothing less.
Therefore one CAN assume it has something to do with a fault with the specific camera used, as it seems to have occurred precisely in the same fashion at different times and on different films (as you have pointed out) with that specific camera and even on the test frame at the beginning. Perhaps there was some light leakage
in that specific camera – I don’t know – I am not the expert here (as you also point out) but I DO know that your image (from Magazine L) DOES confirm my assessment here.