You have to make sure the timing is right. I would use something like a cup because it has a flat bottom and you can keep it still. If you use a piece of paper, then it will look bad if you just have someone hold it. The object has to be in the exact same place. Here
is a clip that I did a while ago. I used a wine bottle to hold the object. Something that I did wrong was that I held the donut too long on the right side and not long enough on the left side. That made me have to speed up the right side to make it look right. That made the clip look bad cause it jitters when I pass it.
So in conclusion, make sure that:
-The object you are moving stays still in between each side when you film
-You have the timing right on both side