How many forms of Jitter can you identify?

I see it very possible that a good, clean, as transparent as possible disc will help the laser pickup work at its best and read the light pulses induced by pit-to-land and land-to-pit transitions with very good temporal accuracy. And since jitter is temporal INaccuracy, this enhanced transparency will reduce jitter.
There is a commercial being broadcast nowadays on TV advertising a product claiming that it will restore one's car's headlamps transparency by removing the layer of oxidation that tends to develop and makes them slightly opaque.
Something like that.
I doubt that such a product will improve a new, or well maintained disc, but may be worth a try for older ones.

There is a good summary of ten potential contributors to jitter in this paper by Steve Nugent of Empirical Audio, about a third of the way down the page.

Note that items 2 and 3, which pertain to the pits on the cd itself, and the electromechanical systems that spin the disk and read the data, are "not an issue ... for newer players that completely buffer the data at high-speed from a CDROM reader to a memory buffer."

IMO, assuming everything involved is reasonably well designed, by far the most major contributor to jitter is the S/PDIF or AES/EBU interface that is commonly used between source and dac. Making the timing that is applied to the dac chip itself ultimately dependent on a clock supplied by a different component, which is multiplexed together with the audio data into a single signal that is then transmitted between components, the clock subsequently having to be extracted from that signal, is an inherently compromised concept IMO. Several different items in Steve's list, btw, pertain to that interface.

At most it should a good cleaning product that could allow the laser to read the disk better eliminating any error correction from being necessary.

Assuming the player is reasonably well designed, error correction is not an issue, because it results in bit perfect recreation of the original data. An issue only arises when the data being read is so badly messed up, for instance due to a severe scratch on the disk, that the errors cannot be corrected. In that case error interpolation, or conceivably outright muting, will occur, which will affect sonics as it represents an approximation at best.

Best regards,
--Al

Well, shortly after I clicked "submit" I came to the realization of my "senor moment" when I totally forgot about the buffering that completely eliminates any possibility of jitter being generated by pit/land reading itself.
What can I say, I wish I could withdraw my post.
But since that's not possible, here I am again, standing corrected and humbled by Al's perfect answer.

The worst forms of jitter are non-random (by far)!

If a disc wobbles while it spins then this may cause cyclical adjustments to the pick up laser servo and these repetitive draws on power may induce variations in the clock through the power supply.

IMHO, the most accurate or reliable approach is an asynchronous setup where the output clock is not synchronized to the input.