You are right. The coils of starry night and apparenza coil counterclockwise. I wonder if the movement is easier for right-handed glassmakers. I don't know.
Most of the things I've noticed have, unfortunately, come from mistake purchases. For example, I bought a Chinese vase a lot like the one from the link Anne posted in another thread: http://www.theglassmuseum.com/Chinese.html
. It was a multicolor vase that was designed like the first vase on the page. The stems of the applied glass flower look like they had been broken, instead of cut. The color particles of the flower looked like confetti that had been dumped under the flower. There was no attempt to fuse the particles to the glass at all. The vase looked like it had been made in a hurry. It would have looked better if the flower and stems had not been applied at all.
Salviati was pretty sloppy with some of their rigaree trim, but I've never seen Murano applied canes that looked like they had been broken off, instead of cut and shaped. This sloppiness is a good indicator of high-production Chinese pieces. I gave the Chinese vase away to someone who thought it was gorgeous. There are many people who enjoy the contemporary wares of China. Some of them are very nice, but not that dreadful multicolor vase! It was in danger of being tossed in the trash.