Good day.
While practicing on the bottle tutorial > http://moi3d.com/forum/messages.php?webtag=MOI&msg=4439.1

I came at 3 problems which I cannot fix and or understand.

1. Attached a pic of some artifacts after lofting the shapes. How can I get this smooth so these will not show up if I want to render this?

2. In the tutorial where the cap is being made of star shapes it is not straight it is tapered but with a curve.
the way I made is with 4 star shapes with different sizes and then loft. Is there a better way of doing this? this is not shown in the tutorial.

3. On the cap where it changes shape from star shaped to circle I could not get a smooth transition either. Loft will end up too sharp.

How can I accomplish these?

Thank you!