An interference engine is one in which if the timing belt breaks, and the valves come fully down, they don't come down far enough to make contact with the piston, thus saving your engine. Typically, an interference engine results in lower compression so its not likely that the Z has it. Again its designed for when the belt / chain breaks not so much for when the valves completely float due to overreving, so it may only be of minimal help in that case. But, if you haven't noticed any rough idle by now you should probably be fine.
I come from a Toyota Celica GT-S (2000) before the Z and many people used to misshift that car all the time due to the tight gearbox and ended up blowing their engines. It got so bad, Toyota actually replaced most of the engines under warranty. Some people were out of luck if they went to a tough dealership to get it fixed.
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