In some neighborhoods or small towns it is easy to leave an order form at one of the local businesses. CAUTION: You might have to travel several miles to deliver the popcorn.

The same (as above) applies to taking orders at church, make sure you get phone numbers so you can call if they are not at church on delivery day.

Ordering lots of extra popcorn with the intention of selling it, you can get stuck with lots of popcorn.
Your church or synagogue will only buy so much, be careful.

Assuming that everyone will remember all the information given them. Remind adults and the Scouts several times. You will be lucky if after one time they remember 50% of the information.