OK, I don't get it

My Dad is the Quiz Champion, Master of the Quiz, Knower of all Things Trivia and Trivial. He could beat your ass silly at Trivial Pursuit. Not the Pop Culture 90s edition Trivial Pursuit that I can do pretty well with but the Old School Original Edition Trivial Pursuit. Yeah, he's hard core.

I have a very fond memory of sitting in the garden of the Witching Elm in Kingston with my dad, on a sunny afternoon, drinking as many G&Ts as I wanted, doing the Sunday quiz section of The Independent. I got all the pop culture questions and Dad got all the classical questions. We made a really good team; until my eyes started cross and I had to quit because I was getting too sloshed.

Anyway, he gave me these ten quiz questions and through the power of Wikipedia and Google I figured out the answers -- except one which I have no idea how to even start answering.

Q1. Where has a hajji been?
A1. A Muslim hajji has been on a pilgrimage to Mecca, a christian hajji has been on a pilgrimage to Jerusalem
Sidebar: Hajji is a very derogatory word used to describe Iraqis and Arabs in general in a TV show I'm totally into right now.

Q2. Who is the Brazilian football player deemed "The White Pele" and recently fired by the Turkish FenerBache?
A2. Roberto Carlos

Q3. What is the name of the London Gorilla who the famous Cricketer Ian Botham was nicknamed?
A3. Guy the Gorilla

Q4. Before destinalization, what Indian coin was 1/16 of a rupee?
A4. I'm not really sure about this but its either an anna or a pai.

Q5. What is the Roman Goddess equivalent of Greek Aphrodite?
A5. Venus

Q6. What is Bob Marley's back up group?
A6. Bob Marley and The Wailers

Q7. In the Hobbit, who had the ring before Bilbo Baggins?
A7. Gollum / Smeagoll. Actually, Smeagoll's cousin, Deagoll, found it while fishing in a lake. Smeagoll wanted the ring as a birthday present and ended up killing his cousin for the ring; beginning Smeagoll's decent into Gollum. Gollum then lost the ring in a tunnel and Bilbo found it there.

Q8. If you ordered "cerveza" in Spain, what would you get?
A8. Beer. I think this is a trick question; trying to get me to think this is a more difficult questions than it really is.

Q9. Which 1966 World Cup winning side member was the last to stop playing (or last to retire)?
A9. I have no idea how to event start to answer this question.

Q10. Which country has a flag that is a plain green rectangle? No symbols, crests, signs, pictures, etc?
A10. Libya

So, the problem is this: what links all the answers together?

Our friend Rick-- who has the been a sometimes unwilling participant of many Trivial Pursuit games -- says that Jeff and I could kick booty in the "World Series of Pop Culture" quiz game show. I whole heartily and unabashedly agree.

Anyway, my Dad rocks. He's always good for a laugh and some fun. I just hope he doesn't think I'm a maroon because I can't answer his quiz questions.