Could we get a copy of the database that included all of these extra records?

From the results I got, he used faker to generate them.

There's a blip on this particular video that shows the migration he whipped up to add the extra fields around 7 minutes in (The Ham named his migration CustomerInformatoin, lulz) , when he's switching windows to do something else. It matches the one I made to add them on my own:

class AddFieldsToAccounts < ActiveRecord::Migration
  def change
    add_column :accounts, :city, :string
    add_column :accounts, :zipcode, :integer
    add_column :accounts, :state, :string
    add_column :accounts, :employees, :integer
  end
end

then

rake db:migrate

If you've been following to this point, it'll go off without a hitch. You could also build the migration with rails generate if you'd prefer.

Then update the Gemfile

gem 'faker', '~>1.4.3', group: :development

Then at the command line:

bundle install

To make my data match his, I used the following code in my db > seeds.rb file

800.times do |n|
    a = Account.new
    a.name =  Faker::Company.name + " " + Faker::Company.suffix
    a.email =  Faker::Internet.email 
    a.city = Faker::Address.city 
    a.zipcode  = Faker::Address.zip_code
    a.state = Faker::Address.state_abbr
    a.about =  Faker::Company.catch_phrase
    a.type = 'Customer'
    a.employees = (rand * 90).to_i

    a.save
end

Which is a slight modification of the faker options shown in another post so I got state abbreviations and full city names (and I'm sure there's a slicker way to concat the company names)

then back to command line to seed that thing, run this as many times as you want:

rake db:seed 

Should be up and running and looking just like the data in the video.

Hope that helps a bit.