Let's see what I can do.
For the zoom into a specific point. If you are using Premiere 1.0 and up you should be able to select the clip you want zoomed. Go to effect Controls for that clip and you should see Motion at the top with a square with marks on the edges next to it. Clicking that box will put a crosshairs and those little resize points on the corners of the clip in the preview. Set a position keyframe.
Now scrub to the point you want the zoom to end. Grab the cosshairs and move the clip so that the part you want zoomed is in the center of the preview window. NOT centered with the crosshairs. This will set another keyframe. Then twirl down the Motion tab and place a Scale keyframe at the start. Then scrub to where you want to end the zoom, and increase the Scale percentage to how much you want. And that should do it.
Not sure about the music skipping or the strobe effect. Sorry
But if you have to make a new project because one fudged up, there is a solution aside from just starting over.
Open a new project and set it up as desired. Then import the ORIGINAL project into the new one. Toss the sequence into your current one and presto. You have your video back.
Nested sequences are your friends.
Hope that helps some.