If the table did not come with plugs, these must be custom made. There are no regular makers of these, so a local craft shop should be the first source to locate a maker.
Pocket billiards ("pool") tables have pockets. Carom billiards tables do not. Apparently the table in the video is a carom billiards table. Whether this was a specific choice or whether it just happened to be handy I don't know.
It is a Carom Game
A yellow pocket is the corner pocket on a snooker table which is nearest to the yellow spot.
There are 6 pockets in a standard table.
It was not a pool table if it only had 4 pockets if it was made since about 1800. A 4 pocket table is most likely a bumper pool table.
In your pocket or on a table in your house.
No.
Probably not.
An aquifer.
A sealed pocket of Air is inside the hollow center of a table tennis ball.
Yes. If the previous shot is "over" , then the cueball will be replaced.
There are many places where one can purchase an Ercol table. One can purchase an Ercol table at Furniture Village, John Lewis, eBay, and Barker and Stone House.