Question regarding Huygens surface video Options

[sittingduck]

Recently I found a short animation of several of the images taken of the Titan surface by Huygens after it landed:

Link to animation.

I see that several objects appear to move in and out of frame, which I have read is attributed to fluffy aerosols kicked up from the surface settling down again.

My question is, what is the explanation for the object which appears to move horizontally from left to right? If it is in fact the same object in all 3 frames from frame 11-13, it appears at (x,y) pixel coordinates (74,290), (119,291), and (212,297). Is it something on the lens, drifting to the side perhaps?

Because I do not know how this sequence of images has been combined, and whether or not they are chronological or in reverse order, or whether there are missing intermediate frames, I cannot estimate the time that passes during the movement of this small blob.

Finally, is there a table somewhere with timestamps of all the Huygens triplets?

Regards,
Nick