New Testament References Old Testament

How many times does the New Testament quote, refer to, or allude to the Old Testament? For a quick look at some introductory answers to this question, click on any of the following links:

Quotations in New Testament Order

Table of Old Testament Quotes in the New Testament, in English

The Relationship of the Testaments: the NT View of the OT

Now, some questions: From looking at and thinking about such content (found at the above links), ...
1) What does this say of the modern views of the Old and New
... Testaments?
2) What does this say of the NT writers' views of the OT?
3) Most importantly, what does this say about knowing the Messiah?
... (Is He only to be found in the NT? Is He only occasionally found in
.... the OT?)
4) What then is the big difference between the OT and the NT?
5) How often does your pastor preach Christ from the OT?