It could be a burn correction error, when telecine CRT tubes are not replaced after a period of time it can produce unfavorable results.
I would talk to your colorist and ask him about it, maybe put it up again during a supervised session. It could be a water drop problem from processing, were they processed at the same place?. Tough to say. Usually specs on the optical lens gate are out of focus, but like I said, tough to say without looking at it. Very hard to understand small random oval marks coming from telecine, unless they cleaned the film and something happened, which is usually not done when film comes straight from the lab. Try to seperate the possibilities from telecine, to processing, to in camera. Usually when something happens in camera or mag the effects will be blue or black- pre processing.
Bryan