Hi everyone - I'm the one who wrote this tutorial - great that more people are finding it! Sorry about any confusion about the 'flap' on the pillowcase. I'm from the UK and now live in Australia and have never seen a pillowcase without a flap!
I think that for me - a pillow is a long rectangle that goes under your head on the bed when you sleep - but I know in some places the square cushions used on chairs and sofas are also called pillows - so maybe there's some confusion there?
Anyway - if your pillow case doesn't have a 'flap' you can just use a scrap of material for the pocket!
Please do let me know if you have any more problems - I'm always trying to make my patterns better and easier to follow!
Jill
http://jembellish.blogspot.com/