1997 Saturn SL1 RPMs climb when push clutch in

Had clutch replaced. $900. When picked car up, all action in 1st inch off floor, such that even though I've driven a stick for 20+ years, I kept stalling the car. Clutch adjusted over week or so. Few days later, with my foot completely off the gas, I push in the clutch and get an rpm climb of 100 to 300 before the rpms fall off. Has gone as high as a several hundred rpm climb. Have tested myself for foot off gas several times.

Q? The mechanic thinks it's "something else." What do you think is wrong. Is this clutch related, so that it should be covered under the work already done? Or is it something new that just decided to show itself now?

thanks