Hey mate, it is always hard to say because there is so much more to an interaction rather than just the words you say i.e. body language, eye contact etc. But....
With the first approach you said "Sorry did I get in your way" which means the chances are you didn't give her enough space when you approached her which could result in her getting frightened or shocked when you jump in front of her. Your observational statement was good as you noticed what she was wearing and what stood out to you but you could of carried on with a better assumption of where she comes from or what she does for a living going on what you see.
With the second and third approach the thing that stood out for me is that you have to listen more. As they key with assumptions is to get that first piece of information (which you did) from the girl which you can then use as a conversational topic. So as soon as you found out one was French and one was from California these were your topics you should have run with, so just then talk about where they are from. As Jon says it doesn't matter if you dont know much about these places as you can say "I dont know much about France but I think it would be like........."
This is how you hook her by 'sucking' her into a conversation lol
Keep up the hard work mate! The first couple of minutes of a daygame approach are the hardest i.e. the attraction stage, as this is where you have to do all the work in getting the girl comfortable to speak to you.
Tom made a good video on it here:http://www.youtube.com/watch?v=NAKbwznPcRc