I followed it (several times from scratch, actually), trying to position 6 Suzannes in a circle. It works for me up to the point when I do Ctr + Shift + A to make duplicates real. When I do this, my 6 Suzannes are still in a circle but the Outliner shows there are now 100 Suzannes in the scene; which is actually true - 94 Suzannes are hidden under one of the 6 other ones.
The number 100 happens to coincide with the default setting of Path Animation -> Frames; I made sure to change that to 6 as mentioned in the tutorial. Which doesn't fix it.
Why does the number of Suzannes go from 6 up to 100 when I make duplicates real? Is there a bug or am I missing something?