I also am having trouble making the scarecrow. Tried the same things you have. I am thinking it is in one of the prize capsules I have not found yet. I bet it is in the Haunted House. I have been thru there 3 times looking for the last capsule and have not found it yet. I know that because the Gold Star list still says I need to find them all in the Haunted House before I get the Gold Star. Let us know when you figure it out.
I FIGURED IT OUT !!! Use the hat next to mariachi hat , and the zombie lady outfit , she has a blue face , and kind of a yellowish suit think . Place her at the entrance to the corn patch and you will get it.
Has anyone found the last card in Bonnie's house , or the junk yard?
Once you make the scarecrow, take him to the entrance of the vegetable garden near slinky. Trust me, it works. if you can't find the spot for whatever reason, go to mission list, press "X" on this mission, then "X" again to turn on the compass for this mission.
I wish they would've included labels for the outfits when youtry to dress up townspeople. Sometimes it's really hard to see the details (and I'm playing on a 37" tv). It even took me a while to figure out that some shirts had Hamm's picture on them when I couldn't really see the details of the picture.
I got all the capsules in SHH area. I'll just keep trying. It can get frustrating since there's so much running back and forth to the garden from the tailor shop.