Some more information from the video:
The presenter buys a tile for Berlin, his Capital, it is in the outmost ring and costs him 105 Gold to buy. Once he chooses to buy a tile those in available are either outlined red or yellow. He buys a yellow tile containing an iron resource. The price stays the same as he hovers over several yellow tiles.
Frankfurt a newly founded City can attack enemies up to two tiles away, even outside it's own cultural borders.
CITY CONQUERING: these are thein game tool-tips:
ANNEX THE CITY:
Annexing the city into your Empire causes it to become a normal City that produces quite a lot of extra Unhappiness.
CREATE PUPPET:
By turning the City into a Puppet, it will generate Gold, Science, Culture, etc. for you, but you may not choose what it produces or customize the City.
It will contribute much less Unhappines than an Annexed City, and will not increase the cost of your Social Policies and Great People. If you choose this, you may later Annex the City at any point.
Two interesting things in the last tool tip. Apparently the number of Cities affects the cost of Social Policies and Great People. Also good to know that you can choose to annex them later.
HAPPINESS BREAKDOWN:
The video shows the current breakdown of happyness in the Empire.
Total Happiness Level of the empire is 0.
38 total Happiness from all sources:
- 20 from havine AT LEAST ONE source of the following luxury resources:
+5 from Gems
+5 from Spices
+5 from Silk
+5 from Wine
- 2 from Social Policies
- 4 from Buildings
- 12 from Difficulty Level
38 total Unhappiness from all sources.
- 10 generated from number of Cities
- 6 from number of Occupied Cities
- 14 generated by Population
- 8 from Population in Occupied Cities
The minimap in the video shows 7 Cities. One of them is Paris and another is Lyon.
So I suppose this means 5 Cities and two Occupied Cities (Paris/Lyon).
Meaning 2 Unhappiness from normal cites and 3 from Occupied Cities plus additional Unhapiness through Occupied Population.
I'll update my original post with this info as well.