What is the difference in features between the old Turkish lira and the new Turkish lira?

The first lira depreciated in value due to some hyperinflation that Turkey experienced. So they passed a law to remove 6 zeroes from the currency to create a new lira. They now just call it the lira.

There are 1,000,000 old lira in 1 New Turkish lira, so your old lira have little money value, just curiOSity value. (1 New Turkish lira is worth (March 2009) about US$0.75.)

Any remaining old lira has to be converted at either the Turkish Central Bank or T.C. Ziraat Bank branches, at the rate of 1 million old lira = 1 new lira

There are pictures of the actual notes on Wikipedia.